Understanding Weathering and Erosion
Ever wonder how massive canyons form? It all starts with weathering and erosion. Weathering breaks down rocks without moving them, while erosion carries those broken pieces away to new locations.
Natural resources found in our environment include both living and non-living substances that humans use to meet their needs. These resources can be affected by weathering and erosion over time.
The main difference is simple: weathered materials stay put, while eroded materials get transported elsewhere. Erosion happens through forces like wind, water, ice, and even human activities, moving soil and rock particles from one place to another.
Fun Fact: The Grand Canyon wasn't carved overnight! It took millions of years of weathering and erosion by the Colorado River to create this amazing landmark.
Types of Weathering
Physical weathering (also called mechanical weathering) breaks down rocks without changing their chemical makeup. This commonly occurs in mountain regions and hot deserts.
Physical weathering happens in two main ways:
- Through repeated freezing and thawing of water in mountain areas
- By expanding and shrinking rock surfaces as they heat up and cool down in deserts