When under a lot of pressure in hot places, rocks may become other types of rocks. What causes this change? Select one:

The thermal energy in the oceans.

The motion of the rocks.

The heat of the sun.

The thermal energy inside the earth.

Afarmer who is grown corn for the past five years notices in the sixth year that the his harvest is significantly smaller, despite an increase in labor on the farm. the following year, the harvest continue to decline. which of the following explanations most plausibly accounts for the reduction in corn yield? a) soil degradation b) desalinization c) better irrigationd) terracing