Geothermal energy is the heat energy which is obtained from the interior of the Earth. However, this energy is not equally available everywhere and is concentrated in some parts of the world such as natural geysers. This is a natural and renewable source of energy that can be used for heating processes in various activities.

Fossil fuels are nonrenewable conventional energy resources found inside the earth's crust where they have been formed through heat and compression on forests and other organic matter buried underneath due to earthquakes, landslides, lava etc. Fossil fuels can be solid, e.g., coal; liquid, e.g., petroleum; or gaseous, e.g., natural gas.

Natural Resources or Earth resources are those living and non living components of atmosphere, hydrosphere and lithosphere, which can be drawn for supporting life or have potential of being used by humans for their requirements of food, fodder, shelter, clothing, articles of use and recreation.

Energy sources are of two categories, renewable and non renewable. 

Forests are the renewable natural resources which can be recycled but should not be used beyond a limit. Coal, petroleum and minerals are exhaustible resources and cannot be recycled. 

Inexhaustible resource is a natural resource, which is found in such abundance, that it is unlikely to diminish or get exhausted. E.g., air, solar energy, wind power, rainfall etc.
Exhaustible resource is a natural resource, which is likely to diminish and get exhausted due to continuous use or exploitation. E.g., minerals, fossil fuels, forests etc. Exhaustible resources are of two types renewable and non-renewable.
Renewable exhaustible resource is a natural resource, which gets replenished, recycled or reproduced. E.g., forests, water, agriculture etc.
Non-Renewable exhaustible resource is a natural resource, which is likely to get exhausted with use. E.g., fossil fuels like petroleum.

• A nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption. For example, Most fossil fuels, such as oil, natural gas, and coal and earth metals, minerals.
• These resources are considered non-renewable because their formation takes billions of years.
• Hence coal and minerals are examples for the non-renewable resource.
• So, the correct answer is 'Coal and minerals'.

Resources are of two types, renewable and nonrenewable. Renewable resources are those resources that can be renewed and replenished. Nonrenewable resources are those resources that cannot be renewed or replenished. Examples of renewable resources include water, solar, wind. Examples of nonrenewable resources include metallic minerals and fossil fuels. 

A non-renewable source of energy is atype of resource which cannot be replenished back or take a very long time to replenish back, so biological species once lost cannot come back.

Renewable source of energy can be replenished in a very short period of time, sunlight is the constant and inexhaustible source of energy.

Since wind energy is a renewable source of energy it is a never ending source thus it is an inexhaustible source.

Coal/petroleum come under the category of non-renewable resource, once finished it cannot be replenished in a short period of time.

Metals & fossil fuels are non- renewable sources because they cannot be replenished in a shorter period of time, while water is a renewable resource.

• Solar pond is a non-conventional source of energy, which is renewable or inexhaustible and do not cause environment pollution. More over they do not require heavy expenditure. Energy generated by using wind, tides, solar geothermal heat are also non-conventional energy sources.
  
• Hydroelectric energy, biomass energy and fossil fuel energy are conventional sources of energy, since they are non-renewable or exhaustible and cause environmental pollution. 
  
• So the correct answer is 'Solar pond'.

Non-renewable energy resource is a resource that is limited in quantity. It cannot be recycled or replenished. The examples include coal, petroleum, natural gas, nuclear energy. The renewable energy resources include hydropower (wind), tidal power (water), geothermal power (solar energy).

Hydropower is a method of generating power by flowing water, which spins the turbines, it is a renewable source of energy and also it is inexhaustible

Coal and petroleum are non-renewable exhaustible natural resources as once used they are lost forever. They are not replenished by nature and their formation takes a very long period of time. 

Minerals and metals are non renewable sources of energy as depletion in it is not possible to renew again.

A non-renewable resource is a resource that does not renew itself at a sufficient rate for sustainable economic extraction. They are found in fixed amounts and are being used faster than they can be replenished. An example is carbon-based, organically-derived fuel. The original organic material, with the aid of heat and pressure, becomes a fuel such as oil or gas. Earth minerals and metal ores, fossil fuels (such as coal, petroleum, and natural gas), nuclear fuels, and groundwater in certain aquifers are all non-renewable resources

Non-renewable resources are resources for which there is a limited supply. The supply comes from the Earth itself and it typically takes millions of years to develop. Non-renewable resources can generally be separated into two main categories; fossil fuels and nuclear fuels. Fossil fuels are derived from organic matter which has been trapped between layers of sediments within the Earth for millions of years. Crude oil/petroleum is a non-renewable resource that builds up in liquid form between the layers of the Earth's crust. The other form of non-renewable resource used to produce energy, nuclear fuels, is primarily obtained through the mining and refining of uranium ore. Renewable energy includes biomass, wind, hydro-power, geothermal and solar sources. 

Renewable energy is defined as energy, that comes from resources, which are naturally replenished on a human timescale such as sunlight, wind, rain, tides, waves and geothermal heat. Trees are very important for us as a renewable energy resource. Trees are a natural resource, that can be renewed - by the planting of trees - replacing the trees, that are harvested for use by people. 

Renewable resources are resources that are replenished by the environment over relatively short periods of time. Some examples of renewable energy sources are solar energy, wind energy, hydropower, geothermal energy, and biomass energy. Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. This is usually due to the long time it takes for them to be replenished. 

Bioenergy is renewable energy made available from materials derived from biological sources. Biomass is any organic material which has stored sunlight in the form of chemical energy. Most non-renewable energy sources are fossil fuels: coal, petroleum, and natural gas. Carbon is the main element in fossil fuels. 

Energy generated by using wind, tides, solar, geothermal heat, and biomass including farm and animal waste as well as human excreta is known as non-conventional energy. 

Inexhaustible resources are resources that are present with unlimited amounts in the nature; they cannot be depleted or exhausted by human activity. Inexhaustible resource is known as a renewable resource. This includes water, sand clay, water as well as solar energy.

A non-renewable resource (also called a finite resource) is a resource that does not renew itself at a sufficient rate for sustainable economic extraction in meaningful human time-frames. Earth minerals and metal ores, fossil fuels (coal, petroleum, natural gas) and groundwater in certain aquifers are all non-renewable resources.

The resources which are available in nature in an unlimited amount, known as inexhaustible resources. These resources can be replenished again and again for use. The light energy is inexhaustible resources which are obtained from the sun. The wind and light energy can be used for the generation of electricity. The sand is available in large amounts and is used for the production of glass. 

A non-renewable resource (also called as a finite resource or depleting source) is a resource that does not renew itself at a sufficient rate for sustainable economic extraction in meaningful human time-frames. An example is carbon-based, organically-derived fuel. Earth minerals and metal ores, fossil fuels (coal, petroleum, natural gas) are all non-renewable resources. In contrast, resources such as sunlight, water, timber and wind are considered renewable resources, largely because their localized replenishment can occur within time frames useful to humans.

The resources which can be replenished again after their consumption are referred as the renewable sources of energy. The trees can be replenished by afforestation method in which new trees can be planted. The agricultural products can be obtained again when the new crops are produced in the farm. The wildlife species once extinct cannot be replenished again. 

The Department of Non-Conventional Energy Sources (DNES) was a new department which was set up in the ministry of energy. The establishment of this department took place in the year of 1982. Later on, the department was transformed into the ministry of non-conventional energy resource. 

The resources which can be replenished again after their consumption are referred as the renewable sources of energy. Water resource can be replenished due to rainfall. Soil production occurs due to the breaking of the rocks. The forests can be replenished through afforestation.

The minerals are obtained from the ores through mining. There are limited resources of the minerals present in the Earth's crust. Lead is used in the making of the batteries of the electronic devices. Gold is known for its commercial value in the making of the jewellery. Tin is used for various purposes from the ancient age. Tin was used for the making of coin, utensils, alloy making, etc. Tin is now commonly used for the preparation of the jars. The exploitation of these metals has resulted in fewer resources left and so, the metal resources will be exhausted first.

The resources which cannot be replenished again after consumption of resources are known as non-renewable resources. Minerals are obtained from the ores and they are available in limited forms. The metals are obtained through mining and are present in reserved amounts in the Earth's crust. The fossil fuels are synthesized due to the decomposition of the dead matter for long period of time. These resources cannot be replenished once they are used up. 

The resources which are available in nature in an unlimited amount are known as inexhaustible resources. These resources can be replenished again and again for use. The resources which can be renewed and are safe to use are known as non-conventional sources of energy. Solar radiations, wind power and sea tides are used for the generation of the electricity. These are inexhaustive and non-conventional resources. 

The resources which cannot be replenished again after consumption of resources are known as non-renewable resources. Coal is obtained from the Earth's crust due to the decomposition of the dead matter for long period of time. It is commonly used as the source of energy. There are limited deposits of coal present and they take a long time to be formed. so, they are known as non-renewable form of energy. 

The resources which can be replenished again after their consumption are referred as the renewable sources of energy. The forest biomass is considered as a great source of energy in the form of wood, charcoal, etc. The forests serve as the renewable energy source. The forests can be replenished by the method of afforestation. 

The minerals are obtained from the ores through mining. There are limited resources of the minerals present in the Earth's crust. Tin is used for various purposes from the ancient age. Tin was used for the making of coin, utensils, alloy making, etc. Tin is now commonly used for the preparation of the jars. The exploitation of the metal has resulted in fewer resources left and so, the metal resource will be exhausted first.

The resources which are available in nature in an unlimited amount are known as inexhaustible resources. These resources can be replenished again and again for use. The solar energy is obtained from the radiations of the sun is an example of an inexhaustible resource. The energy is a safe energy source and does not cause any type of pollution.

The resources which can be replenished again after their consumption are referred as the renewable sources of energy. The forests can be replenished through afforestation. The programs like hugging the tree, tree plantation program, etc have been undertaken in order to increase the forests resources.

Biomass is organic material formed by the decomposition of dead plants and animals. The living forms such as plants and animals can be replenished by reproduction. Hence, biomass is a renewable and sustainable source of energy. It is used to generate electricity or other forms of energy. Thus the correct answer is option D.

They all are fuels because they release heat energy when they are burned. They are fossil fuels because  they were formed from the remains of living organisms millions of years ago.

Resources which get exhausted and are not available in nature in plenty and are known as exhaustible natural resources. They take longer to get replenished. For example coal, petroleum, forest, minerals, etc.

The resources which cannot be replenished again after consumption of resources are known as non-renewable resources. The minerals and metals are obtained from the ores through the process of mining. There are limited reserves of the ores in the Earth's crust.

The resources which can be replenished again after their consumption are referred as the renewable sources of energy. The forests can be replenished again through the process of afforestation. In this method, new trees are planted to cover the area under forests. 

Forests, soil and water are renewable resources because they are replaced naturally and hence can be repeatedly used.

An energy source that will run out in future is known as a non-renewable energy resource. Thus coal is a non-renewable energy resource.

Inexhaustible resource is a natural resource that will never run out so if we take advantage of the greatest  natural resources will not be depleted and will continue to exist, such as water, sunlight, tidal energy, ocean energy and wind energy.

• There are different types of resources. 
• The non-renewable forms of resources cannot be replenished again when the source gets exhausted. 
• The coal is an example of a non-renewable source of energy. 
• Soil, water, and solar energy are examples of the renewable sources of energy.
• Thus, the correct answer is option C. 

The processes for which any CO2 is not evolved is :

• all the forms of nuclear energy,

• hydroelectricity (though dam reservoirs in the tropics might free a little methane, which is a greenhouse gas, because of the decaying of biological debris in the water),

• sun rays,

• wind,

• tidal energy,

• geothermal energy,

• biomass if replanted.
• So the correct option is C.

Hydropower is a renewable, non-polluting and environmentally benign source of energy. Sardar Sarovar dam uses hyropower to produce electricity.

Energy obtained by using wind, tides, solar etc. in renewable energy, also called non-conventional energy, solar energy is inexhaustible source of energy.

Fuel gas, coal, petroleum, cannot be replenished back once they are finished, they are non-renewable sources, while forest if tried can be obtained back.

Renewable products can be obtained back once finished, products from agricultural activities can be considered as a renewable product.

• Renewable energy is energy generated from natural resources —such as sunlight, wind, rain, tides, trees and geothermal heat—which are renewable (naturally replenished).
• Trees are very important for us as a renewable resource. Trees are a natural resource that can be renewed by planting of trees and replacing the trees that are harvested for use by people.
  
• Hence the Best source of renewable energy is trees.
• So, the correct answer is 'Trees'.

Renewable source of energy is a type of resource which can be replenished back easily. Coal, petroleum, kerosene will take millions of years to replenish back so, they are non-renewable source of energy.

Inexhaustible resources are also called as renewable resources. These are present win abundance in the nature. They cannot be depleted or exhausted by human activity. Examples include water, sand and solar energy. Human energy is the greatest inexhaustible resource.

A non-renewable resource (also called as finite resource) is a resource, that does not renew itself at a sufficient rate for sustainable economic extraction. Non-renewable resources are resources, that are not easily replenished by the environment. Earth minerals and metal ores, fossil fuels (such as coal, petroleum, and natural gas), nuclear fuels, and groundwater in certain aquifers are all non-renewable resources.

The resources which can be replenished again after their consumption are referred as the renewable sources of energy. Water is considered as the renewable form of energy. The water reserves can be replenished by the rainfall. The water resource is degradable form of resource. The contaminants and pollutants from the industries can degrade the quality of the water in the water bodies.