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| The condition of the Earth's atmosphere at a particular time and place. |
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| The layer of gases that surrounds the planet. |
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| A form of oxygen that has 3 oxygen atoms in each molecule. |
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| Water in the form of a gas. |
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| The harmful substances in the air, water or soil. |
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| A brown haze that forms in cities because of the action of sunlight on chemicals in the atmosphere. |
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| When a layer of warm air prevents polluted air from rising away from the city. |
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| Rain that contains more acid than normal becuase pollutants in the air combine with water to form acids. |
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| The amount of mass in a given volume. |
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| The force pushing on a given area or surface. |
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| The force of a column of air pushing down on an area. |
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| Instruments that are used to measure changes in air pressure. |
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| A barometer made of a glass tube open at the bottom and partially filled with mercury. Changes in air pressure move the mercury up and down the glass tube. |
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| An airtight container that is sensitive to changes in air pressure. Changes in the shape of the container move the needle to record the pressure changes. |
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| The distance above or below sea level. Also called elevation. |
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| The lowest layer of Earth's atmosphere. Where weather occurs. |
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| The 2nd layer of the atmosphere. It extends to 50 km above the Earth and ozone at the top of this layer absorbs UV radiation. The top of this layer is warm. |
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| The 3rd layer or "middle" layer of the atmosphere. 50-80 km above the Earth. This layer is getting colder. |
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| The outermost layer of the atmosphere. No definite edge. 80+ km and out into space. Very thin air. Very HOT! |
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| The lower part of the thermosphere. Composed of ions ( + and - charged particles) |
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| The outermost layer of the thermosphere. Satellites orbit in the exosphere. |
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| A brilliant light display in the ionosphere. Also called the Northern Lights. |
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