Multiple choice

Which of the following is an example of weathering?

  1. river current breaking down rock in a canyon

  2. rain causing water levels to rise in a river

  3. ocean waves carrying away sand from the coastline

  4. wind blowing grains of rock across the desert
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A Correct answer
Explanation

Weathering is the physical or chemical breakdown of rocks into smaller fragments at Earth's surface. A river current wearing down and breaking apart rock in a canyon represents weathering, whereas carrying those pieces away would be erosion.

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