MSI chapter 24

The most abundant gas in the air is

• oxygen

• nitrogen

• carbon dioxide

• hydrogen

Earth's weather occurs primarily in the

• thermosphere

• stratosphere

• troposphere

• mesosphere

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Wind is caused by differences in

• air pressure

• altitude

• humidity

• precipitation

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The amount of water vapor in the air is called

• dew

• rain

• humidity

• precipitation

A type of cloud that is commonly associated with fair weather is

• cumulus

• cumulonimbus

• altostratus

• nimbostratus

When the temperature equals the dew point, the relative humidity is

• zero

• about 25%

• about 50%

• 100%

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When a warm air mass overtakes a cold air mass, the result is a(n)

• cold front

• stationary front

• warm front

• occluded front

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Lines connecting areas of equal pressure on a weather map are called

• isotherms

• barometers

• isobars

• weather symbols

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Generally, climates located farther from the equator have

• warmer ocean currents

• lower temperatures

• more rain

• higher relative humidity

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A periodic warming of water in the central and eastern Pacific Ocean is called a(n)

• monsoon

• jet stream

• global warming

• El Nino

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