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NOTE: Most long sentences are combinations of smaller sentences. One of the

most common kinds of long sentences occurs when "and" is used to combine
sentences so that the speaker doesn't have to repeat phrases that occur in both
sentences. Compare the sentences below.

EXAMPLES:

The troposphere's height varies from the equator to the poles. The troposphere's
height varies from season to season. (combined) The troposphere's height varies
from the equator to the poles and from season to season.

2. Use the information given to make combined sentences as shown below.

Information: The troposphere contains 75% of the atmosphere by weight.
The troposphere contains almost all of the weather.

Combined: The troposphere contains 75% of the atmosphere by
weight and almost all the weather.

Information: The tropical zone extends 1600 miles north of the equator.
The tropical zone extends 1600 miles south of the equator.
Combined: The tropical zone extends 1600 miles north and south of the equator.

Information:

a. Each part of the earth has one "day" period every 24 hours.
Each part of the earth has one "night" period every 24 hours.
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b. This section is a review of basic meteorology.

This section is a review of weather terminology.
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c. The troposphere is the layer of air that begins at the surface of the earth.
The troposphere is the layer of air that extends upward about 7 miles.

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d. The stratosphere begins above the troposphere.
The stratosphere extends upward to a height of 22 miles.

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