Answer:
1. core - source of Earth's internal energy
and magnetic field
2. mantle - layer where convection currents
circulate, driving plate tectonics
3. crust - layer where tectonic plates collide,
spread, and rub, creating surface
features and events, like volcanoes and
earthquakes
Explanation:
In descending order, the earth is composed of the following layers; crust, mantle, outer core, and inner core.
The crust and inner core are solid. The inner core is mainly solid due to the enormous pressure of the overlying layers that prevent the rocks in the layer from melting in the very high temperatures. The inner and out core are the main layers that give off heat that drives the convection current of the mantle. The convection currents of the mantle subsequently cause the tectonic plate movement of the crust.
The outer core of the earth is responsible for the magnetic shield of around the earth that protects it from high energy radiations from the sun.
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