What forces cause erosion?

In Science, we've been learning about changes on Earth's crust.  Last week, we learned that water, wind, ice, plants, and temperature changes can weather rocks.

What happens to these pieces of weathered rock?

This week, we learned that water, wind, and ice (glaciers) can move weathered materials such as sand, soil, pebbles, rocks (even boulders!) during erosion.

Erosion in Action

When these forces can no longer move weathered materials, they are deposited, or dropped, in a new place.  This process is called deposition.

Erosion and deposition are big problems for some Floridians.  Check out this news clip to see Google Earth satellite images of beach erosion over the years in Ponte Vedra Beach, just south of us.

Here's a Study Jam on Weathering and Erosion.

So, fourth grade scientists, what is the difference between physical weathering and erosion?