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44 Cards in this Set

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Which of the following is considered a high-level cloud?

cirrostratus

Which of the following is considered a mid-level cloud?

nimbostratus

Cooling air becomes saturated at a temperature called the __?__.

dew point

What type of drought occurs when precipitation cannot supply enough moisture to the ground to support an area's crops?

agricultural drought

Which type of drought is based on water shortage's effect on people?

socioeconomic drought

Which type of cloud forms a flat, gray layer of heavy clouds not far above the ground?

stratus

Which type of front forms when a warm air mass moves into a region occupied by a cold air mass?

warm front

Which type of front forms a Y shape?

occluded front

Precipitation made of ice crystals that fall to the ground is called __?__.

snow

Which type of air mass brings cool, wet weather?

maritime polar

Which type of air mass brings warm, moist weather?

maritime tropical

The process of liquid becoming a gas is __?__.

evaporation

When the temperature of air rises, relative humidity will __?__.

decrease

The year-round atmospheric conditions typical of a certain place are its __?__.

climate

The movement of water from the earth's surface, into the air, and back to the surface is the __?__ cycle.

water

An almond-shaped cloud is a __?__.

lenticular cloud

An __?__ air mass brings very cold and dry weather.

Arctic

A low that forms along a front is called a __?__.

frontal cyclone

Which type of front forms when two air masses push against each other but neither advances?

stationary (front)

What is a mixture of smoke and fog called?

smog

What is the amount of water vapor in the air called?

humidity

What phenomenon occurs when an area receives an abnormally low amount of precipitation over a long period?

drought

What is rain that freezes before it hits the gound?

sleet

What is the study of weather and of the atmospheric conditions that produce weather?

meteorology

What phenomenon occurs when air mass remains stationary over a region for a long time?

air-mass weather

List the three factors that affect the density of an air mass.

temperature, humidity, and pressure

A substance going from a solid to a liquid is __?__.

melting

Water vapor in the air that touches the ground and turns to ice is __?__.

frost

Water vapor in the air that touches the cooler ground and turns to a liquid is __?__.

dew

Ice crystals in clouds that grow large enough to fall to the ground are __?__.

snowflakes

Layered balls of ice are called __?__.

hailstones

White, billowy clouds that resemble piles of cotton puffs are __?__.

cumulus

What type of fog is found along the slopes of mountains?

upslope fog

Drops of liquid water that have a diameter of 0.5 millimeter or greater and fall from the clouds to Earth are called __?__.

rain

Snowflakes with white, feathery branches forming a leaf-or star-shaped pattern are __?__.

dendrites

Air that is completely full of water vapor and can hold no more is considered __?__.

saturated

The most frequent type of cloud is the __?__.

stratocumulus

Which of the following statements is true?

All of the above.

The ratio comparing the actual humidity to the humidity of saturated air under the same conditions is __?__.

relative humidity

A large body of air with relatively uniform properties is a(n) __?__.

air mass

Airborne water vapor cannot turn into liquid without a small particle called a(n) __?__.

condensation nucleus

The three major factors that determine the earth's weather are __?__,__?__, and __?__.

heat energy, uneven distribution of heat energy, and water vapor

A thick, brownish haze that results from complex molecules released into the air by vehicles and some factories and plants is __?__.

photochemical smog

ESSAY: List and explain the two processes that form rain.

Answers should include the following ideas:



In the Bergeron process (or cold-cloud process), water vapor in portions of a cloud below freezing nuclei. The ice crystals absorb water vapor from the cloud and stick to each other, growing large enough to be snowflakes. The snowflakes fall through the cloud, melting in warmer air near the ground to form rain.



In the collision-coalescence process, larger-than-normal condensation nuclei in regions of the cloud above freezing cause the formation of "giant" cloud droplets, which grow larger by colliding with smaller droplets. When they become too big to remain suspended in the air, the droplets fall to the earth as rain.