The atmosphere

Nitrogen represents ………………% of the atmosphere

• 21

• 78

• 1

The ………………… helps to keep the temperature suitable for the earth

• oxygen

• nitrogen

• carbon dioxide

The closet layer to the earth is the ……………….

• thickest

• thinnest

• fattest

plants need ……………… in photosynthesis

• oxygen

• nitrogen

• carbon dioxide

the atmosphere consists of …………………. Layers

• three

• five

• seven

The gas that prevent the earth from burning is ……………………

• oxygen

• nitrogen

• carbon dioxide

A gas that inhaled by human during respiration is ……………….

• oxygen

• nitrogen

• carbon dioxide

The carbon dioxide represents ……………% of the atmosphere

• 78

• 1

• 21

A gas that help living things to make protein ………………

• oxygen

• nitrogen

• carbon dioxide

The most abundant gas in the atmosphere …………………..

• oxygen

• nitrogen

• carbon dioxide