Unit 4 test (Lesson 3-4) Flashcards

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0
Q

What is an air mass? How do air masses form?

A

Is a large volume of air in which temperature and moisture content are nearly the same throughout. Air masses from when the air over a large region of earth stays in one area for many days.

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1
Q

What is a front? How can a front form?

A

A boundary that forms between the air masses. Fronts form from one air mass must run into another air mass.

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2
Q

What are jet streams? How do they work?

A

Long distance winds that travel above global winds for thousands of kilometers. Jet streams form earth’s surface because it is unevenly heated . They flow from east to west.

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3
Q

What is a thunderstorm?

A

Is an intense local storm that forms strong winds, heavy rain, lighting thunder, and sometimes hail. It is an example of severe weather.

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4
Q

What is lighting? How does it form?

A

Is an electric discharge that happens between a positively charged area and a negatively charged area.

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5
Q

What is thunder? How is it made?

A

Rapidly moving air causes the air to vibrate and release sound waves. The result of that is thunder.

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6
Q

What is a storm serge?

A

When a hurricane moves into a coastal area, it also pushes a huge mass of ocean water.

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7
Q

What is a hurricane?

A

Is a tropical low-pressure system with winds blowing at speeds of 119 km/h (74 mi/h) or more-strong enough to uproot trees. They are sometimes called typhoons when they form over the western Pacific Ocean.

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8
Q

How does a hurricane begin?

A

It begins as a group of thunderstorms moving over tropical ocean waters. Then, thunderstorms form in areas of low pressure. Near the equator, warm ocean water provides the energy that can turn a low-pressure center into a violent storm.

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9
Q

What is a tornado?

A

Is a destructive, rotating column of air that has very high wind speeds and that is sometimes visible as a funnel-shaped cloud.

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10
Q

How do tornadoes form?

A

It forms when a thunderstorm meets horizontal winds at a high altitude. These winds cause the warm air rising in the thunderstorm to spin.

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