What happens to the pieces when rocks break up?

When rocks are broken up by water and wind, the smaller pieces that are produced are not simply discarded or destroyed. Instead, they go through a natural process that allows them to become an essential part of the environment. The correct answer to the question is option 'B' - they become part of the soil. Let's explore this in more detail.

1. Weathering and erosion:
- Water and wind are agents of weathering and erosion, meaning they have the ability to break down rocks into smaller pieces.
- Water enters the cracks and crevices of rocks, and when it freezes and expands, it exerts pressure that causes the rock to break apart.
- Wind can carry small particles such as sand, which can act as abrasives, wearing down rocks over time.

2. Formation of soil:
- The smaller pieces of rock that result from weathering and erosion are called sediment.
- Sediment can vary in size, from tiny particles like clay to larger fragments like sand and gravel.
- Over time, these sediments accumulate and mix with organic matter, such as dead plants and animals, to form soil.
- The process of soil formation is called pedogenesis.

3. Importance of soil:
- Soil is a vital resource for plants, animals, and humans.
- It provides a medium for plant growth, supplying nutrients, water, and anchorage for roots.
- Soil also serves as a habitat for a wide range of organisms, including earthworms, insects, microorganisms, and burrowing animals.
- It acts as a filter, purifying water as it percolates through the soil layers.

4. Nutrient cycling:
- As rocks break down and become part of the soil, they release minerals and nutrients that are essential for plant growth.
- This process, known as nutrient cycling, ensures that these vital elements are continuously recycled and available for use by living organisms.

Conclusion:
In summary, when rocks break up due to the forces of water and wind, the smaller pieces become part of the soil. This process is important for the formation of soil, which provides essential nutrients and support for plant growth, serves as a habitat for various organisms, and plays a crucial role in nutrient cycling.