The correct answers are:
- Moving water;
- Ice and glaciers;
- Humans and animals;
The erosion is a process which basically can be described as the removal of the material from the place from which it was broken away, from the basic material, through the process of weathering.
The erosion can be performed by numerous agents, be it biotic or abiotic. The moving water is one of the biggest contributors to the erosion, as it has sufficient power, speed, and mass to move the material away with ease. The ice and glaciers, with their spreading and movement, manage to drag with them a lot of material, thus removing it from its original spot. The humans and the animals too contribute to the erosion, and even though on percentage it is very little, still they are able to move away the material for their own needs, which of course causes erosion.
