Page 135 - Science Course 2 (Book 2)

Mo11-L2b: What is Deposition

SUMMARY Let’s Begin
How Does Weathering Affect Earth’s Surface?

Physical and chemical weathering work Erosion
together and change Earth’s surface. They
break down rock and form sediment The minerals and small pieces of rock produced by
weathering are called sediment.

Moving water causes erosion by picking up rock
Mo11-L2b What is Deposition? pieces and sediment, which scrape along the ground
picking up more material.
KEY CONCEPTS:
1. How does deposition change Earth’s surface?
2. How are erosion and deposition related?

Vocabulary A-Z

Let us learn some vocabulary

sediment Large masses of ice, called glaciers, cause erosion
rock material that from when rocks are broken down by f owing down a mountain and
into smaller pieces or dissolved in water as rocks removing rock and sediment.
erode.
Erosion by glaciers makes
deep valleys and
steep peaks.

Deposition
the laying down or settling of eroded material.

Strong winds also can erode and move sediment.

Deposition Erosion Soil and rock that are not protected by plants can be
eroded by wind.

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