Choose the correct vocabulary word for each definition.
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#1Definition
The force created by the weight of the air above you, pushing outward in every direction.
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#2Definition
The layer of gases that surrounds Earth and is held in place by gravity.
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#3Definition
A state of matter with no fixed shape or volume — its particles spread out to fill any container. Air is a mix of several of these.
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#4Definition
A force that pulls objects toward each other. On Earth, it pulls everything toward the ground.
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#5Definition
The amount of force pushing on a given area. The same force squeezed into a smaller area means more of this.
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#6Definition
A measure of how hot or cold something is.
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#7Definition
The day-to-day conditions in the sky — like rain, sun, wind, or snow — at a specific place and time.
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#8Definition
How high something is above sea level.
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#9Definition
A tool used to measure the force of the air pushing down from above.
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#10Definition
The parts of Earth — from deep oceans to mountain tops — where living things exist.
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#11Definition
What something is made of, in terms of the elements and compounds it contains.
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#12Definition
A measure of how much mass is packed into a given amount of space. More mass in the same space means a higher value.
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#13Definition
The outermost layer of Earth's gases, where the air thins out and gradually blends into space.
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#14Definition
The warming that happens when certain gases in the air trap heat near Earth's surface instead of letting it escape into space.
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#15Definition
All of Earth's water — oceans, lakes, rivers, ice, and groundwater — combined.
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#16Definition
A region high in the sky where sunlight knocks electrons loose from gas particles, leaving behind a layer of charged particles. It overlaps the mesosphere and thermosphere.
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#17Definition
Earth's solid outer shell — the crust and the rigid upper part of the mantle beneath it.
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#18Definition
The boundary at the top of the coldest air layer, where temperature stops dropping and starts rising again with height.
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#19Definition
A layer of gases high above Earth with the coldest temperatures in the whole atmosphere. Most meteors burn up here.
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#20Definition
A gas made of three oxygen atoms bonded together, which absorbs most of the Sun's harmful ultraviolet rays.
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#21Definition
The boundary at the top of the layer where jet planes often fly, where temperature stops rising and starts dropping with height.
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#22Definition
A calm layer above the lowest layer of air, where temperature rises with height and most of Earth's ozone is found.
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#23Definition
The lowest layer of gases surrounding Earth, where nearly all clouds, storms, and everyday weather happen.
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#24Definition
A layer high above Earth where the few remaining gas particles absorb intense solar energy and reach very high temperatures — even though the air there is far too thin to feel warm.
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#25Definition
The boundary at the top of the lowest air layer, where rising air stops cooling and temperature levels off with height.
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#26Definition
Changes or differences between one thing and another.
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#27Definition
Water in its gas form, invisible and mixed into the air.