Weathering: The Erosion of Rock by Natural Forces

The video explains how rocks are worn away by natural forces through processes called erosion and weathering. Weathering is further divided into physical, chemical, and biological types. Physical weathering involves processes like wind and ice, while chemical weathering is driven by acidic rain dissolving rocks. Biological weathering occurs when plants and animals contribute to rock breakdown. Each type of weathering plays a significant role in shaping the Earth's surface.

What is the primary difference between erosion and weathering?

• Erosion involves the breakdown of rocks, while weathering involves their removal.

• Erosion is caused by biological factors, while weathering is caused by physical factors.

• Erosion and weathering are two terms for the same process.

• Erosion refers to the removal of rock material, while weathering refers to the breakdown of rocks.

Which of the following is an example of physical weathering?

• Acid rain increasing due to pollution

• Ice forming in rock cracks and splitting them

• Roots growing into rock cracks

• Rainwater dissolving limestone

How does temperature change contribute to physical weathering in desert regions?

• By freezing water in rock cracks

• By expanding rocks during the day and contracting them at night

• By dissolving rocks with acidic rain

• By causing rocks to melt during the day

What role does rainwater play in chemical weathering?

• It physically breaks rocks apart.

• It carries sand that scours rock surfaces.

• It dissolves rocks by being naturally acidic.

• It freezes in cracks and splits rocks.

Which organisms contribute to biological weathering by boring into rocky surfaces?

• Sponges, barnacles, and sea urchins

• Birds and insects

• Reptiles and mammals

• Fish and amphibians