Page 111 - Science Course 1 (Book 2)

Mo9-L3b: What Makes Up the Mo9-L3c: What are the Layers of
Earth’s Atmosphere? the Atmosphere?

The most common liquid particles in the atmosphere What are the Layers of the
are water droplets. Mo9-L3c Atmosphere?

Though microscopic in size, water particles are KEY CONCEPTS:
visible when they form clouds. 1.What are the layers of the atmosphere?
2. How do air pressure and temperature change as
Other atmospheric liquids include acids that result altitude increases?
when volcanoes erupt and fossil fuels are burned.

Acids in the air are formed when sulfur dioxide and Vocabulary A-Z
nitrous oxide combine with water vapor.
Let us learn some vocabulary

troposphere
the atmospheric layer closest to the Earth’s surface.

Key Concept
What Makes Up the Earth’s Atmosphere?
stratosphere
What is Earth’s atmosphere made of? the atmospheric layer directly above the troposphere.

ozone layer
the layer of atmosphere that prevents most harmful
radiation.

SUMMARY ionosphere
What Makes Up the Earth’s Atmosphere? a region within the mesosphere and thermosphere
containing ions.
Earth’s atmosphere consists of gases that
make life possible.

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