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