What are some of the natural agents that cause the Earth's surface to wear down?

• Sunlight, heat, and gravity

• Water, ice, wind, and chemicals

• Volcanic activity, earthquakes, and tsunamis

• Plant growth, animal burrowing, and human activity

How can freezing water contribute to the erosion of rocks?

• It dissolves the minerals in the rock, making it weaker.

• It creates a chemical reaction that breaks down the rock's structure.

• It expands as it turns into ice, exerting pressure that can split rocks.

• It carries away loose rock particles as it flows over the surface.

What causes the dark streaks often seen on rocks containing iron?

• The rock being scratched by other rocks.

• Iron in the rock reacting with water and oxygen to form rust.

• Algae growing on the surface of the rock.

• The rock being exposed to extreme heat.

How are mushroom rocks typically formed in desert environments?

• By heavy rainfall washing away the top layers of rock.

• Through the expansion and contraction of ice within rock cracks.

• By wind carrying sand particles that erode the lower parts of rocks more than the top.

• Due to volcanic activity shaping the rock formations.

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