Download Convection Currents and the Mantle

Heat Transfer
CONVECTION CURRENTS AND THE
MANTLE
HEAT TRANSFER
Earth’s molten outer core
is nearly as hot as the
surface of the sun.
 Heat is transferred from
the core to the surface of
the Earth through liquids
and solids.

HEAT TRANSFER
What heat
transfer?
Heat
Transfer – is
the movement of
energy from a
warmer object to a
cooler object.
HEAT TRANSFER
What are
the types of
heat
transfer?
There
are three
types of heat
transfer:
Radiation
Conduction
Convection
RADIATION
What is
radiation?
 Radiation:
is the
transfer of energy
through empty space.
RADIATION

Example:
 Sunlight
is radiation that warms the Earth’s
surface
 Heat you feel from around an open flame or fire
Radiation
CONDUCTION
What is
conduction?
 Conduction:
is heat
transfer by direct
contact of particles of
matter.
CONDUCTION
 Example:
 Heat
is transferred from the hot soup and
the pot to the particles that make up the
spoon.
Heat
transferred to
the particles
of the spoon
from the pot
and hot water
CONVECTION
What is
convection?
 Convection:
is heat
transfer by the movement
of a heated fluid
 During convection heated
particles of fluid begin to
flow. Transferring heat
energy from one part of
the fluid to another.
CONVECTION
What
causes
convection?
What is
density?
 Heat
transfer by
convection is caused by
differences of
temperature and density
within a fluid.
 Density - Is a measure of
how much mass there is in
a volume of a substance.
CONVECTION CURRENT
A
What is a
convection
current?
constant flow begins
as the cooler fluid
continually sinks to the
bottom of the pot and
the warmer fluid rises.
 Convection Current – is
the flow that transfers
heat within a fluid
CONVECTION
CONVECTION CURRENT
What sets
convection
currents in
motion?
 The
heating and cooling
of the fluid, changes in
the fluid’s density and
the force of gravity
combine to set
convection currents in
motion.
CONVECTION AND THE EARTH’S MANTLE
 Earth’s
Where does
the heat
source for
the Earth’s
currents
come from?
mantle responds
to heat.
 Convection currents flow
in the Asthenosphere.
 The heat source for these
currents come from the
Earth’s core and from the
mantle itself.
CONVECTION AND THE EARTH’S MANTLE
CONVECTION AND THE EARTH’S MANTLE