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| Earth's _____________ is a thin layer of gases that surround the Earth. |
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| Dry air is 78% ______________ and 21% ___________. |
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Definition
| 78% nitrogen and 21% oxygen |
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| Then density of a fixed volume of air _________ as its mass increases. |
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| In termperature inversion a layer of _____________ air traps polluted air close to Earth's surface. |
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| The major source of photochemical smog is |
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Definition
| Emissions from cars and trucks. |
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| Ozone that forms close to the Earth's surface as smog is ___________ to humans. |
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| According to the theory of global warming, the increase in _________ is causing Earth's temperature to rise. |
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| The greenhouse effect will be made stronger if ________ occurs. |
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| As air pressure increases, the column of mercury in the barometer ____________. |
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| Weather occurs in the ____________ |
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| The condition of Earth's atmostphere at a particular time and place is known as |
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| Because of the atmosphere water consists as a ______________ |
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| The atmospheric gas called ___________ forms clouds when it condenses |
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| The gas that is found in the greatest amount in the atmosphere is |
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| The radioactive gas that is normally formed by certain types of rocks underground is called |
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| Certain gases react with water vapor in the air to form acid that return to Earth's surface as |
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| The dangerous gas ____________ can build up indoors when wood, coal, oil or gas is incompletely burned. |
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Definition
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| The main chemical in photochemical smog is ________ which forms when sunlight reacts with certain gases. |
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Definition
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| The ozone layer is important because it helps to screen out harmful ________. |
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| Gases called __________ block the cycle in the ozone layer that absorb ultraviolet radiation. |
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Definition
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| The _____________ traps heat near the Earth's surface which makes sure Earth doesn't get too cold. |
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| The weight of a column of air pushing on an object causes __________. |
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| The ___________ of air can be calculated if the mass and the volume of air are known. |
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| Because air has mass it exerts a force per unit area called ______. |
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| A _________ measure air pressure. |
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| On a mountain top, a person runs out of breath quickly because fewer _____________ molecules per cubic meter of air. |
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| The ________ of a mountain top is its distance above sea level. |
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| Satellites orbit in part of the thermosphere called the _______. |
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| In part of the atmosphere called the _______________, aurora occurs. |
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| The main layers of the atmosphere are classified by changes in ________. |
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Definition
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| Describe 3 way the atmosphere helps living things survive on Earth. |
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Definition
1. provides oxygen
2. causes weather
3. protects us from ultraviolet radiation |
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