Page 169 - Science Course 3 (Book 2)

The Movement of the Earth Mo12-L2a: How Does the Earth Move?

Lesson 2

rotation
the spin of an object around its axis.

In this topic, you will learn the following rotation axis
lessons:
Mo.12–L2a: How Does the Earth Move? the line on which an object rotates.

Mo.12–L2b: Why Do the Seasons Change?
Axis
Direction
of spin

Mo12–L2a How Does the Earth Move?

KEY CONCEPTS:
1. How does Earth move?
2. Why is Earth warmer at the equator and colder at
the poles?

Vocabulary A-Z Let’s Begin

Let us learn some vocabulary

Earth and the Sun
orbit
The nearest star to Earth is the Sun.
the path an object follows as it moves around
another object.
The Sun is approximately 150 million km from Earth.

Earth moves around the Sun in a nearly circular path.

revolution
the orbit of one object around another object.

The path an object follows as it moves around an-
other object is an orbit.

The motion of one object around another object is
called revolution.

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