Why is soil important? why do we protect it? what is soil erosion?

Soil is important because it distributes plant species and provides a habitat for a vast range of organisms.

And, we protect it because it provides food, water, filters air and decomposes biological waste into nutrients for a new plant life.

Soil erosion is wears off a field's topsoil by natural physics of water.

I thought u was talking about a Chinese historical problem