Weathering and Erosion Quiz

Grade 4 · Science · Quiz

Test your knowledge of how Earth's surface is shaped by weathering and erosion.

Questions

1. Which agent of erosion carved out the Grand Canyon over millions of years?

   1. Wind
   2. Glaciers
   3. The Colorado River
   4. Gravity
   Show answer

   Answer: The Colorado River

   The Colorado River eroded the rock over millions of years, cutting deeper and deeper to form the Grand Canyon.

2. A tree root grows into a crack in a rock and slowly splits it apart. What type of weathering is this?

   1. Chemical weathering
   2. Physical weathering
   3. Erosion
   4. Deposition
   Show answer

   Answer: Physical weathering

   Tree roots physically push against rock, breaking it apart without changing its chemical composition, making it physical weathering.

3. When sand and soil are dropped at the bottom of a river delta, this process is called:

   1. Weathering
   2. Erosion
   3. Evaporation
   4. Deposition
   Show answer

   Answer: Deposition

   Deposition is the process of eroded sediment being dropped and settling in a new location.

4. Rainwater mixes with carbon dioxide to form a weak acid that dissolves limestone rock. This is an example of:

   1. Physical weathering
   2. Deposition
   3. Chemical weathering
   4. Ice wedging
   Show answer

   Answer: Chemical weathering

   When water and carbon dioxide combine to form carbonic acid and dissolve rock, the rock's chemistry changes, so this is chemical weathering.

5. Which of the following best describes erosion?

   1. Rocks being broken into smaller pieces by freezing water
   2. Sediment being carried away by wind or water
   3. Minerals in rocks changing due to acid
   4. Rocks forming deep underground
   Show answer

   Answer: Sediment being carried away by wind or water

   Erosion is specifically the movement and transport of weathered material (sediment) by agents like wind and water.

6. Farmers plant grass and trees along the edges of fields to help prevent:

   1. Chemical weathering
   2. Deposition
   3. Soil erosion
   4. Physical weathering
   Show answer

   Answer: Soil erosion

   Plant roots hold soil in place and reduce the speed of water runoff, both of which prevent soil from being eroded.

7. Glaciers can cause erosion by picking up rocks and soil as they move slowly across the land.

   Show answer

   Answer: True

   Glaciers are massive moving ice sheets that scrape and carry rocks, soil, and sediment as they advance, making them powerful agents of erosion.

8. When water gets into a rock crack and freezes, it expands and breaks the rock. This process is called ice ______.

   Show answer

   Answer: wedging

   Ice wedging occurs when water freezes in cracks, expands by about 9%, and physically forces the rock apart.

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