Tag: evs - i

Air is a bad conductor of heat and not a good conductor hence the temperature on the earth is maintained for life to exist unlike the other planets. Atmosphere prevents sudden increase in temperature during the day light hours. It slows down the escape of heat into outer space during the night.

The earth that we live on is one of the planets of the solar system. Its crust is deep and we stay on its uppermost layer. The upper layer of earth is formed by soil. It can get weathered away due to external forces like water, wind etc.

The lithosphere is referred to the solid part of the Earth. This is the part which includes the crust and the upper mantle. There are two types of the lithosphere. The oceanic lithosphere is the part which is comprised of the oceans. The continental lithosphere is the part which is comprised of the continental crust. The continental part comprises of a more thick layer.

The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass. 

An envelope of gas that surrounds earth is called atmosphere. It contains 78% nitrogen, 21% oxygen, 0.03% carbon dioxide, 0.9% argon and traces of other gases like helium, little amount of water vapour, dust particles and other solid particles. So, the correct option is D.