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What gas makes up 78% of our atmosphere?
When a candle burns, what happens to the oxygen?
It is burned up.
The condition of Earth’s atmosphere at a particular time and place is called….
T or F Smoke is made up of solid particles in the air.
What gas makes up 21% of our atmosphere?
The atmosphere protects us from harmful rays of the sun plus…..
Water vapor is a liquid and steam is a gas.
The more molecules in a volume of air, the greater it’s …..
Plants take in carbon dioxide and give off ….
Air has mass because it is composed of …..
Atoms and Molecules
Density increases if we put ___ molecules in it.
The amount of oxygen is less at high or low altitudes?
What do we call an instrument used to measure air pressure?
As air pressure decreases, what happens to the column of mercury?
Mercury is one type of barometer. Name another type.
Inches of mercury is one way we express air pressure. What is another?
What is another word for elevation?
Air pressure is weakest.
On a mountain top
2011年上半年 我院团学工作活动图片展播 2011年8月28日.
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