The best phrase to define erosion is the moving bits of rock and soil from one place to another.
Answer: Option 2
Explanation:
Erosion is a natural process which can turn into disaster if the erosive agent is more than the surface. The erosive agents are the agents which create the erosion process.
In erosion, the external erosive agents will remove the bits of rock and soil from the surface and displace them to another place. The erosion can turn into disaster when large amount of water, wind and glaciers will erode the surface in high speed.