Question

the temperature of the earth is constant in the crust and increases only in the mantle

Answer 1

As we go deeper inside the earth the temp of the earth increases.thats why in crust temp is constant and in mantle temp increases.

Answer 2

Explanation:

The temperature will be 1000°C in the crust's base, almost 3500°C at the base of the mantle, and nearly 5,000°C at the center of the earth. The temperature gradient inside the "lithosphere (upper 100 km)" can be variable depending upon the "tectonic setting".

Due to the arrangements of plates inside the earth's layers and based on the climatic conditions, the temperature inside the earth's layer may vary. The mantle is the place where the temperature gets varied based on many factors.