Answer:
The Stiffer Mantle is 930 miles into the Earth. It is 123,000 miles deep.
Explanation:
The short term human induced environmental changes are pollution and deforestation.
The term deforestation can be defined as the cutting down of trees in huge amount. The reason can be cutting down of trees for human settlement.
Pollution can be defined as the undesirable in the environment. This can be soil pollution, air pollution, land pollution, noise pollution or water pollution.
The effects of these two human induced environmental changes is short term.
I believe the blank would be the dirt soil