Spheres of the earth - class-IX
The equatorial and polar regions of the earth receive unequal solar heat. The convection current arising due to this is called:
Tick the correct answer.
The major constituent of atmosphere by percent is
State whether these sentences are true (T) or false (F).
Carbon dioxide is an important constituents of air.
State whether these sentences are true (T) or false (F).
The atmosphere is composed mainly of nitrogen and oxygen.
The lowest layer of the atmosphere called troposphere, which varies from $4$ to $5$ miles in depth at the poles to approximately $10$ miles at the equators, consists of ____________________.
Which of the following gases abounds most in the composition of the atmosphere?
What is the percentage of oxygen in the atmosphere?
The atmospheric layer nearest to the earth's surface is called _______________.
The vertical movement of air is called _________.
Atmosphere is classified into different zones, which of the following is not among this classification?
Which of the following layers of atmosphere absorb UV light radiations?
_____ consists of a large number of gases.
The uppermost layer of the atmosphere is called _____________.
Which of the following gas is present in large quantity in atmosphere?
Which of the following gases protects us from harmful sun rays?
Ozone is present in which of the layers of atmosphere ____________.
Anything that brings a change to the natural composition of air is known as _____________.
What is the reason for the Troposphere to be at a greater height at the Equator?
Layer where the atmosphere thins out and merges with interplanetary space is called ______________.
In which layer of the atmosphere all the weather and climate phenomenon take place?
The altitudes/height of heavenly bodies appears to be greater than they actually are. This is due to ____________________.
Since many years, oxygen parlours has been in existence in _______.
Which part of the atmosphere is called homosphere?
The part of the atmosphere above the 90 km from the earth is called ________.
Consider the following statements-
(a) Alluvial soil are formed by sediments deposited by rivers.
(b) Black soil is found in the dry and Semi-dry areas of Rajasthan and Gujarat.
(c) Red soil cannnot retain much moisture.
(d) Laterite soil is found over lava deposits in the Deccan.
Which of the above statements are correct?
In which state, terrace farming is practised?
In the lower parts of the stratosphere, there is no change in temperature with altitude. This zone is called ________.
The part of atmosphere which is consists of variable gasses with unknown composition is called ____________.
The narrow band of land, water and air where all kinds of life is possible is known as ___________.
Percentage of oxygen in the earth's atmosphere is __________.
Our country India is one of the twelve __________ countries of the world.
How many biosphere reverses have been set up in the country to protect flora and fauna?
The most abundant constituent of dry air in terms of volume is ________.
Gases which increase the temperature of the atmosphere such as carbon dioxide, methane, chlorofluorocarbon, etc are known as ___ gases.
The most important layer of the atmosphere is ________.
The lower layer of the atmosphere is known as __________.
As we go up the layers of the atmosphere, the pressure ________.
Through the process of photosynthesis plants absorb ___ from the atmosphere and release ___ into it.
The layer present between stratosphere and thermosphere is _______________.
The thermosphere begins at a height of _____________.
The height of mesosphere extends from ____________.
Which of the following statements is true:
A.The troposphere is thinner at the poles
B.The troposphere is thicker at the poles
The atmospheric layer that supports life is _________.
Aeroplanes fly in which of the following layers of atmosphere?
The stratosphere and mesosphere together are sometimes referred to as _______________.
Thermosphere consists of ____________.
The region of Earth's upper atmosphere that extends from about 60 km (37 mi) to 1,000 km (620 mi) altitude is called __________.
Troposphere extends from surface of earth to _________.
Which layer of the atmosphere lies close to the earth?
The inert gas which constitutes about 1% of the earths atmosphere is ____________.
Read the following statements:
i. Ozone is found mostly in the stratosphere
ii. Ozone layer lies 55-75 km above the surface of the earth.
iii. Ozone absorbs ultraviolet radiation from the Sun.
iv. Ozone layer has no significance for life on the earth.
Which set of the statements is correct?
The zone which separates the troposphere from stratosphere is______________.
The changes in the atmosphere produce changes in the weather and ______________.
All the atmospheric changes i.e. rain, winds, etc. take place in ______________.
Which of the following are in correct order?
A column of air 1 sq. em. in cross-sectional area extending from sea-level to the top of the atmosphere weights approximately.
The stratosphere is said to be ideal for flying jet aircraft because ____________________.
In which region water is found in solid state?
Landforms having an altitude of more than _____ meters above the mean sea level and with steep slopes are called mountains.
What does the Landform with almost flat top and comparatively higher elevation than the surroundings is known as?
It is estimated that the major chunk of rainwater falling on the western ghats reaches the sea within _______.
It takes more than thousand years to form one ______ of soil.
Minerals are obtained from ________.
Contour bunding is used _______________.
The National Institute of Oceanography headquarter is located at _______.
Isopleth for depth is _____________,
Which of the following statements about Earth's atmosphere is wrong?
Which one of the following is the largest ocean?
The diameter of earth is _____________.
Which of the following is not covered in the term biosphere?
Which of the following statements is wrong?
The solid outer-covering of the earth which envelopes its interior portion is called ____________.
The gaseous envelop of the earth which consists of mixture of gases and water vapours is called ______________.
Because of the compressibility of air, more than $50$% of the mass of the atmosphere is in its _________________.
How many times larger the sun is as compared with the earth?
Which of the following layers of atmosphere contains the electrically charged particles and reflects the ratio waves back to the earth's surface to make wireless communication possible?
In the troposphere, the temperature decreases at the rate of $1^\circ$ Celsius for every _______.
Which Indian city has huge machines which pump fresh air into the atmosphere?
What is the upper part of the atmosphere called?
The composition of is the atmosphere is somewhat uniform up to ______ from the surface of the earth.
Which of the following is a community of plants and animals which occupies a large geographical area within a particular climate zone?
Biosphere is existing because the interaction of ___________.