Answer:
3.) Pumice
Explanation:
"Pumice is widely used as an abrasive in soaps and cleaners. It is considered one of the softest abrasives on earth."
There's four stages in the classical demographic transition model:
Stage 1 - Pre-transition
In this stage, the birth rates are very high, but also the life expectancy is very low, thus the growth of the population is slow.
Stage 2 - Early transition
In this stage, the birth rates are very high, but the life expectancy is increased, so the population grows rapidly.
Stage 3 - Late transition
In this stage, the birth rates decline slightly, and the life expectancy is a bit higher, thus the population growth is slowing down.
Stage 4 - Post-transition
In this stage, the birth rates are declined significantly, the life expectancy is pretty high, so the population is either growing very slowly, or it is declining.
As I said in your other post/question on the same topic, you have to rephrase your question in order for us to help you. =)
Answer:
The wise use of the earth's resources by humanity is called Conservation of natural resources. It is the proper management of a natural resource to prevent its exploitation, destruction or degradation.
Explanation:
Crop rotation. Crop rotation is the practice of growing a series of different types of crops in the same area across a sequenced of growing seasons. It reduces reliance on one set of nutrients, pest and weed pressure, and the probability of developing resistant pest and weeds.
