An invisible layer of gases that envelopes Earth.

One of the major gases in the Earth's atmosphere 5 billion years ago which is also found in water composition.

It refers to the release of gases from hot molten rocks.

The compound dissolved in water that forms the early limestone rock. 

The gas that makes up the 21%  of our atmosphere.

CFC's stands for __________.

It was believed that this thing provided energy that broke up hydrogen and oxygen in water.

A relatively more stable and unreactive gas in the atmosphere.

The __________ between atmosphere and solar energy is said to be responsible for weather and climate. 

Light  gas CH₄ stands for __________.