1. weather and the atmosphere 2 the weather may be hot or cold, wet or dry 3 vocabulary: weather the...
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Weather and the Atmosphere
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The weather may be hot or cold, wet or dry
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Vocabulary:
weather
The condition of the air around us
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Weather is caused by four factors
1. Temperature2. Moisture3. Air pressure4. Wind
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All weather develops in the atmosphere
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Earth is surrounded by a blanket of air called the
atmosphere
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The atmosphere is a mixture of gases
About three-fourths of the atmosphere is nitrogen
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Almost one-fourth is oxygen
The rest of the atmosphere is carbon dioxide and other gases
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These gases are important to living things
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People and other animals use oxygen as they breathe
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Plants use carbon dioxide to make food
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Living things use nitrogen to make proteins
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The atmosphere is in layers around Earth
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The layer closest to Earth is the troposphere
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Vocabulary:
troposphere
The layer of the atmosphere closest to Earth where nearly
all weather occurs
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Nearly all weather occurs in this layer
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The next layer up is the stratosphere
Vocabulary:
stratosphere
The layer of the atmosphere that reaches from the
troposphere to 30 miles above the Earth
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The stratosphere contains an important gas called ozone
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Ozone keeps most of the sun’s harmful radiation from
reaching Earth
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Farther out are the mesosphere and thermosphere
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Vocabulary:
mesosphere
The layer of the atmosphere beyond the stratosphere
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Vocabulary:
thermosphere
The layer of the atmosphere where the air becomes thin
and fades into space
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The air in the thermosphere becomes thinner and thinner
until it fades into space
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