Page 90 - Science Course 1 (Book 2)
P. 90
Mo9-L1b: What is the Atmosphere?
The atmosphere contains
Mo9-L1b What is the Atmosphere? a mixture of nitrogen,
oxygen, and smaller
KEY CONCEPTS: amounts of other
1. What are the composition and the structure of the gases.
atmosphere?
Vocabulary A-Z
Let us learn some vocabulary
atmosphere
a thin layer of gases surrounding Earth
Key Concept
What is the Atmosphere?
What is the composition of the atmosphere?
Let’s Begin
The Atmosphere
Earth’s gravity pulls gases into a layer surrounding Thermal energy from the Sun heats the atmosphere;
the planet. This layer is called the atmosphere. however, different parts of the atmosphere absorb or
ref ect this heat in different ways.
Exobase
Karman line
Ozone layer
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