We know that heat from Earth's interior is responsible for the movement of the tectonic plates that make up the crust. Where doe
s the majority of this heat energy originate?
A)
Radioactive decay of elements in the mantle and crust generate about 80%
of the heat energy flowing to the surface.
B)
The dynamo generated within Earth's core creates heat energy as a product
of friction hat energy flows to the surface.
o
Because both the outer core and lower mantle are liquids, as the move
they generate the heat needed to drive plate tectonics.
D)
The source of most of the heat energy flowing to Earth's surface is heat
that was generated when Earth was formed; as Earth cools over time, that
energy is transferred through the layers.
Although more complex animals like invertebrates and multi-celled organisms began to appear, it was very late compared to the original, simpler organisms for which the Precambrian time is characterized by.
