Air pressure is air pushing on things.
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The atmosphere is the air around Earth.
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Gas is air. Gas spreads out.
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Gravity pulls things down to Earth.
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Pressure is a push. Air can push.
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Temperature tells how hot or cold something is.
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Weather is what the air is like today. Rain, sun, wind, or snow.
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Altitude is how high something is in the sky.
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A barometer measures air pressure.
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The biosphere is all living things on Earth.
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Chemical composition means what something is made of.
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Density means how packed something is. More packed = heavier.
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The exosphere is the outer layer of air.
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A greenhouse traps heat. Gases in the air trap heat.
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The hydrosphere is all the water on Earth.
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The ionosphere is a layer of air with charged particles.
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The lithosphere is the land part of Earth.
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The mesopause is the top of the mesosphere.
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The mesosphere is a cold air layer above the stratosphere.
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Ozone is a gas that blocks harmful sunlight.
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The stratopause is the top of the stratosphere.
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The stratosphere is a layer above the troposphere. Planes fly here.
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The troposphere is the lowest air layer. Weather happens here.
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The thermosphere is a very hot air layer.
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The tropopause is the top of the troposphere.
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Variations mean changes or differences.
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Water vapor is water in gas form.
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