Tag: earth and structure

The solid portion of the earth is called the Lithosphere. It comprises the rocks of the earth’s crust and the thin layers of soil that contain nutrient elements which sustain organisms.

North America is the third largest continent of the world. It is linked to South America by a very narrow strip of land called the Isthmus of Panama.

Layers of the atmosphere. The atmosphere is comprised of layers based on temperature. These layers are the troposphere, stratosphere, mesosphere and thermosphere. A further region at about 500 km above the Earth's surface is called the exosphere.

Biosphere,

71% of the surface of the earth is covered by water. The ocean and the seas covering largest surface area of the globe are of paramount significant to all of the living organism including man of the biosphere because they help in functioning of global hydrological cycle through atmospheric- oceanic circulation system. It absorbs carbon dioxide and thus help in reducing green house effect caused by human activities. It also help in the dispersal of seeds and small animals through ocean currents. 

There are 5 oceans in the world which covers about 70% of the total earth surface.These five oceans are namely, Pacific Ocean, Atlantic Ocean, Indian Ocean, Arctic Ocean and Antarctic ocean. Pacific Ocean is the largest ocean in the world on the other hand Arctic Ocean is the smallest ocean.

The lithosphere is the solid, outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust, the outermost layers of Earth's structure. It is bounded by the atmosphere above and the asthenosphere below.

Water covers  71 percent of the total surface area of the earth.