Which changes occur in the composition of the earth's layers from the core to the surface?
a.
the material is hotter and denser.
b.
the material is cooler and denser.
c.
the material is hotter and less dense.
d.
the material is cooler and less dense.

The correct answer would be B.  The material is cooler and denser.

As we move from the core to the crust of the earth, the temperature and pressure of the layer keep on decreasing.

For example, the temperature of the inner core is around 9000 to 13000° Fahrenheit. The temperature of the outer core is around 7200 to 9000° Fahrenheit.

Similarly, the pressure also decreases as we move from core to crust.

Consequently, the density of the material increases as they become solidified.

well, since there is no answer choices, i will give an answer on how it works : )

the two objects are placed together. energy will always be transferred from the hotter object to the cooler object until they are equal. hope this is close to one of the answer choices : )