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Air is -------------- and has the same properties as --------------.
matter, gases
Air ------------ on heating and --------------- on cooling.
expands, contracts
Air is made up of ------------, oxygen, carbon dioxide, ------------- -----------------, and small amounts of other gases.
nitrogen, water vapor,
Oxygen is needed for --------------- and - -----------------.
survival, burning
Plants need the gas ----------- --------- to make their food.
carbon dioxide
Some bacteria can change nitrogen in air into a --------------- that plants can use.
nutrient
The layer of air surrounding the Earth is called the ---------------------.
atmosphere
The .................... helps to keep the Earth warm by trapping some heat from the Sun.
atmosphere
The atmosphere is divided into five layers: ------------, ------------, -----------, ----------------,and --------------------.
troposphere, stratosphere, mesosphere, thermosphere, and exosphere
The -------------- is the layer of the atmosphere closest to the Earth's surface.
troposphere
The ---------------- is the layer of the atmosphere farthest from the Earth's surface.
exosphere
Events related to weather take place in the --------------.
troposphere
The ozone layer is present in the ----------------.
stratosphere
Meteors entering the Earth's atmosphere burn up in the --------------.
mesosphere
Space shuttles and the International Space Station are present in the ---------------.
thermosphere
Satellites orbit the Earth in the ------------.
exosphere
