Earth's internal heat comes from two main sources - radioactive decay in the mantle and crust, and leftover heat from Earth's formation. This internal heat is distributed to the surface through several processes. Mantle convection accounts for about 80% of the heat flow, where hot rocks physically move heat through convection currents. The remaining heat comes from the crust through conduction and from minor volcanic and earthquake activity on the surface. Much of Earth's internal heat originates from the immense heat generated during the planet's formation over 4.5 billion years ago, with radioactive decay continuing to add heat today.

1. THE DISTRIBUTION OF
EARTH'S INTERNAL HEAT
TO IT'S SURFACE
Tuesday Group

2. HOW DOES THE INTERNAL HEAT
DISTRIBUTE TO OUR EARTH'S SURFACE?
Earth's internal heat flow to the surface
is thought to be 80% due to mantle
convection, with the remaining heat
mostly originating in the Earth's crust,
with about 1% due to volcanic activity,
earthquakes, and mountain building.

3. WHAT IS EARTH'S INTERNAL HEAT?
 Most of Earth’s internal heat is left
over from when our planet formed,
about 4.5 billion years ago. Earth
and the other planets in the solar
system first began to take shape
as countless smaller bodies
collided and clumped together. The
energy of those violent collisions
transformed into heat energy. As
the early Earth grew bigger, gravity
began pulling matter toward the
center. The intense compression of
material deep inside the Earth
increased internal heat even
further.

4. WHERE DOES THE EARTH'S
INTERNAL HEAT COME FROM?
Earth's internal heat budget. The flow of
heat from Earth's interior to the surface is estimated at
terawatts (TW) and comes from two main sources in
roughly equal amounts: the radiogenic heat produced
by the radioactive decay of isotopes in the mantle and
crust, and the primordial heat left over
from the formation of the Earth.

5. Conduction is the process of heat transfer in which heat
is transmitted from one region to another region through
molecular collisions without any actual flow of matter.
Heat transfer takes place as a result of transfer of
internal energy from one molecule to nearby molecules.
Heat transfer in solids takes place by conduction.

6. Conduction is the process of heat transfer in which heat
is transmitted from one region to another region through
molecular collisions without any actual flow of matter.
Heat transfer takes place as a result of transfer of
internal energy from one molecule to nearby molecules.
Heat transfer in solids takes place by conduction.

7. Convection Helps to Move Heat Within Earth The
fact that the temperature gradient is much lower in
the main part of the mantle than in the lithosphere
has been interpreted as evidence of convection in
the mantle. When the mantle convects, heat is
transferred through the mantle by physically moving
hot rocks.

8. Certain elements, known as radioactive elements
such as potassium, uranium, and thorium, break
down through a process known as radioactive
decay, and release energy. This radioactive decay
in Earth's crust and mantle continuously adds
heat and slows the cooling of the Earth.