monday, october 19, 2015 homework: make 10 vocab flash cards: direct evidence, indirect evidence,...

Monday, October 19, 2015• HOMEWORK: Make 10 vocab flash cards: direct

evidence, indirect evidence, pressure, Alfred Wegner, Pangaea, convection current, heat transfer, convection, conduction, and radiation

• Quiz on Earth's interior on Wed 10/21

OBJECTIVE: I will be able to explain Alfred Wegner’s ideas about continents. I will be able to describe different types of heat transfer

• DO NOW: Turn in Earths Interior HW. No HW=Pink Slip!

• Use notes to make 9 vocab flash cards: crust, continental crust, oceanic crust, mantle, lithosphere, asthenosphere, mesosphere, outer core, inner core

Earth’s Interior HW

• Alfred Wegner - a German polar researcher, geophysicist and meteorologist

• Wegner’s Hypothesis: All the continents were once joined together in a single landmass and have since drifted apart.

– The continents were joined together about 300 million years ago in a supercontinent called Pangaea.

Alfred Wegner and Convection Currents –Doc#

I will be able to explain Alfred Wegner’s ideas about continents. I will be able to describe different types of heat transfer

– What do you think of Wegner’s theory?


– Why do you think many people doubted his hypothesis?

– Do you think Wegener’s hypothesis seems possible?



• There are three types of heat transfer: radiation, convection, and conduction.



• Heat is constantly being transferred inside Earth

• When an object is heated, the particles that make up the object move faster = more energy

• The movement of energy from warmer objects to cooler objects is called heat transfer


Heat Transfers

– Radiation – transfer of energy that is carried in rays (ex. sun warming skin)

– Convection – heat transfer by the movement of a fluid (ex. air currents)

– Conduction – heat transfer between materials that are touching (ex. feet on hot sand)




What other examples of heat transfer can you think of?

radiation

convectionconduction

conduction convection

radiation



• Convection current – the movement of a fluid, caused by differences in temperature, that transfers heat from one particle to another

• Heating and cooling of a fluid , changes in fluid’s density, and the force of gravity combine to set convection currents in motion


1. Heating and cooling

2. Change in density

3. Force of gravity

CONVECTION CURRENT


• Heat from the core and the mantle cause convection currents in the mantle

• There are also convection currents in the outer core – causing Earth’s magnetic field


Convection Currents in the Mantle

COLD is more dense so it sinks.

HEAT is less dense so it rises.

CrustMantle

MantleOuter Core

Heat from Outer Core warms the rock. The rock becomes less dense and rises in the Mantle.

Cold from Crust cools the rock. The rock becomes more dense and sinks in the Mantle.

Lava Lamps and Convection Currents

• Create a diagram of a lava lamp. • Label the parts of the lamp.• Illustrate the movement of the wax and label the

direction of its movement.• Explain the reason for the movement of the wax in the

lava lamp.


• Create a model that explains how a lava lamp is a convection current.

How does the movement of the wax in a lava lamp compare to the movement of the rock in the mantle?

(HINT: What three things set convection currents into motion?)



1. Heating and cooling of a liquid

2. Change in density of the liquid

3. Force of gravity


monday, october 19, 2015 homework: make 10 vocab flash cards: direct evidence, indirect evidence,...

Documents

convection currents

alfred wegners ideas

transfers heat

heat transferi

examples of heat transfer

skinconvection heat

wegners theory

hot sandalfred wegner