Scientists can't determine because it's far to fragile and hot to dig into the earth therefore we don't know exactly how it is just can give an estimate based on what we already know from the other layers
The correct answer is False. Planets travel on their elliptical orbits. They move faster when they are closer to the sun. The presence of external gravitational forces and elliptical orbit will never give them a constant rate.
Answer:
Uniformitarianism means:
d. geologic processes that operate today operated in the past at about the same speed.
Geothermal heat- to provide energy for process like subduction, melting and metamorphism (to drive plate tectonics)
solar energy- for processes like erosion, weathering and transport
