Question

soil formation
three types of weathering
soil formation provides the basis for life on land. rocks break down into component pieces, creating parent material for soil. it comes from rock weathering, a process involving physical, chemical, or biological factors.
physical weathering occurs when rocks crack or break apart due to factors like freezing and thawing, water movement, or wind - blown sediments.
chemical weathering is the alteration of minerals within rocks by water and gases, often causing them to disintegrate.
biological weathering is driven by organisms like plants, lichens, and mosses, accelerating rock breakdown by chemically altering rock substances
how does chemical weathering occur?

• by chemically breaking down rocks by water and gases
• plants, lichens, and mosses accelerating breakdown
• due to physical factors such as freezing and thawing

Explanation:

To determine how chemical weathering occurs, we refer to the left - hand text. It says "Chemical weathering is the alteration of minerals within rocks by water and gases, often causing them to disintegrate."

• The second option describes biological weathering (involving plants, lichens, mosses).
• The third option describes physical weathering (involving physical factors like freezing and thawing).
• The first option matches the description of chemical weathering as it involves water and gases chemically breaking down rocks.

Answer:

A. by chemically breaking down rocks by water and gases