Here's why:

* Erosion is the gradual wearing away and transporting of Earth's surface materials by natural forces like:

* Wind: Wind can pick up loose sand, dust, and soil, carrying it away.

* Water: Rain, rivers, and waves can carve out channels, carry away sediments, and shape landscapes.

* Ice: Glaciers can scrape and grind away rocks, carrying them along as they move.

* Gravity: Gravity can cause landslides and rockfalls, moving large amounts of material downhill.

So, erosion is not just the moving of rocks and soil, it's the entire process of wearing away and transporting those materials.