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Air (Grade 6)

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Air

1. 
A blanket of air, made up of gases, liquids, and some solid matter, is called the
  1. universe.
  2. atmosphere.
  3. water cycle.
  4. greenhouse effect.
2. 
Air that moves across Earth's surface due to differences in pressure is called                .
  1. wind
  2. air pressure
  3. ozone
3. 
What is air pressure?
  1. force exerted on us by wind
  2. force exerted on us by air molecules
  3. force exerted on us by clouds
  4. force exerted on us by gravity
4. 
The amount of water vapor held in the air is
  1. rain.
  2. humidity.
  3. air pressure.
  4. clouds.
5. 
The jet stream is
  1. a high-altitude river of air.
  2. the exhaust trail left behind by a speeding airplane.
  3. slow moving air mass over the Gulf of Mexico.
  4. in the Pacific Ocean off California.
6. 
A helium-filled balloon will float in air because
  1. there is more air than helium.
  2. helium is less dense than air.
  3. helium is as dense as air.
  4. helium is more dense than air.
7. 
A bird is flying constantly in the air, but a "stickiness" in the air suddenly slows it down. What is this force called?
  1. drag
  2. thrust
  3. gravity
  4. wind
8. 
Earth's atmosphere during the first billion years of its existence was made up mainly of which two gases?
  1. oxygen and nitrogen
  2. carbon dioxide and ammonia
  3. carbon dioxide and nitrogen
  4. oxygen and sulfur dioxide
9. 
The most abundant gas in the atmosphere is
  1. oxygen.
  2. nitrogen.
  3. carbon dioxide.
  4. water vapor.
10. 
Which of the following are the two main sources of oxygen in the air we breathe?
  1. volcanoes and animals
  2. animals and phytoplankton
  3. green plants and volcanoes
  4. phytoplankton and green plants
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