Please provide definitions for the following terms: overgrazing, primary minerals, rain-fed agriculture, pedologist, and dust.

here are the answers for questions 1.3.1 to 1.3.5.

Question 1.3.1

Allowing livestock to graze vegetation so heavily that the plants cannot recover.
The term for this is overgrazing.

The final answer is $\boxed{\text{Overgrazing}}$

Question 1.3.2

Minerals that are still in their original form.
These are known as primary minerals.

The final answer is $\boxed{\text{Primary minerals}}$

Question 1.3.3

When farmers water crops with rain.
This practice is called rain-fed agriculture.

The final answer is $\boxed{\text{Rain-fed agriculture}}$

Question 1.3.4

A person who studies the upper layer of the earth in terms of its physical and chemical characteristics.
This person is a pedologist (or soil scientist).

The final answer is $\boxed{\text{Pedologist}}$

Question 1.3.5

Cloudiness caused by suspended solid particles such as sand.
This phenomenon is referred to as dust or a dust cloud.

The final answer is $\boxed{\text{Dust}}$