Which of the following is characteristic of both weathering and erosion?
a. occurs naturally
b. caused by burrowing animals
c. occurs with movement
d. caused by the pull of gravity

The question says, which of the following is characteristic of both weathering and erosion. The correct option is C. Both weathering and erosion occur as a result of movement. It can be movement of wind or water. Wind erosion occurs as a results of movement of wind while water erosion occurs as a result of movement of water. The same applies to weathering.

Protons have a positive charge and, collectively, give an element its atomic number.