What do you call the layer of gases that surround the Earth that is retained by gravity? 

The atmosphere protects living things from the sun’s harmful rays. Gases reflect or absorb the strongest rays of sunlight.

What gases composes the atmosphere on the Earth? 

What layer of atmosphere is known as the weather sphere is the lowest-most layer, it starts from the ground (or sea level) of our planet and expands up to 10-18 km up in the sky?

What layer of the atmosphere has the lowest temperature of all layers(-90°C)?  Most of the meteors burn up in this layer.

Give the measurement in kilometer in each layer of the atmosphere.

Identify the layers of the atmosphere and the objects seen in them. 

Why is atmosphere important to our life? 

What are the layers of the atmosphere?

Earth is the only planet in the solar system known to have life. The three main reasons are the Earth’s atmosphere, the presence of water, and the presence of water vapor