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.

A) The surface of the Sun

B) The core of the Earth

C) They are about the same

Heat Transfer – is the movement of energy from a warmer object to a cooler object.

What heat transfer?

There are three types of heat transfer: Radiation Conduction Convection

What are the types of heat transfer?

Radiation: is the transfer of energy through empty space.

What is radiation?

Example: Sunlight is radiation that warms the

Earth’s surface Heat you feel from around an open flame

or fire

Radiation

Conduction: is heat transfer by direct contact of particles of matter.

What is 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: 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.

What is convection?

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.

What causes convection?

What is density?

A 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

What is a convection current?

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.

http://www.youtube.com/watch?v=MmMX83diwl0Current

What sets convection currents in motion?

Earth’s 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.

Where does the heat source for the Earth’s currents come from?

A) Layer of Earth in the core

B) Includes the Crust and upper Mantle

C) Layer below the lithosphere made of “weak” rock

D) Another name for mantle

The mid-ocean ridge is a divergent boundary.

How Earth's Inner Structure Affects Its Surface

6th Grade Exit Slip

Answer the following question: What are the three types of heat transfer?