Page 163 - Science Course 3 (Book 2)

Mo12-L1b: How Does the Moon Affect Earth?

eclipse
Mo12–L1b How Does the Moon Affect Earth?
the movement of one solar system object into the
shadow of another.
KEY CONCEPTS:
1. How does the Moon affect Earth?
2. How do solar and lunar eclipses differ?

Vocabulary A-Z

Let us learn some vocabulary

Let’s Begin

Earth’s Moon

Gravity holds the Moon
in orbit around Earth.

The Moon is about
one-fourth the size of
Earth, is dry, airless,
and made mostly of
rock.

The Moon rotates on its axis, and revolves around
Earth, orbiting Earth once every 27.3 days.
waxing Because the Moon revolves and rotates in the same
a phase of the moon during which more of the lit amount of time, the same side of the Moon always
part of the moon is visible each night. faces Earth.

waning
a phase of the moon during which less of the lit
part of the moon is visible each night.

tide
the periodic rise and fall of the ocean’s surface
caused by the gravitational force between earth
and the moon, and earth and the sun.

Low tide

High tide

High tide
The Moon is visible because it ref ects sunlight.

The Moon completes a cycle of phases every 29.5
Low tide days.

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