In the convection currents in a lava lamp, the cooler, more dense

goo __.

a. rises to the topb. sinks to the bottomc. stays where it isd. goes in circles

CRCT Question

Corny Joke of the Day

Why didn’t the mummy have any

friends?

He was too wrapped up in himself

Monday: Finish Continental Drift Notes Tuesday: Gallery walk, Tier 2 CD Worktime Wednesday: Tier 2 CD worktime-DUE AT THE END OF CLASS Thursday: STUDY GUIDE DUE, Review activities Friday: Vocabulary Sheet DUE. TEST

Week at a Glance

Tier 2 Rubric Vocabulary: (10 pts each)

1. Alfred Wegener2. Pangaea3. Harry Hess4. Sea-floor Spreading5. Magnetic Pole Reversale 6. Glossopteris 7. Fossil Evidence 8. Geological Evidence9. Climate Evidence10 pts. Organization/Presentation

Vocabulary Sheet

Complete 1-4

1. density

Density = Mass/Volume. The amount of mass in a given space.

Cold material=more dense=sinkHot Material=less dense=rises

2. continental crust

section of earth's crust that is foundunderneath the continent. Layer that

we live on!

3. oceanic crust

section of earth's crust that is foundunderneath the ocean. Thinnest

Layer. More DENSE then continental

4. mantle

the layer of hot, solid, molten material between Earth's crust and core. Thickest Layer. Contains the convection currents

What does this represent?

Welcome to Ms. Evans Cheer Camp

When I say transform you

say

Slide

Transform

Transform

When I say Divergent you

say

Apart

Divergent

Divergent

When I say convergent you

say

Collide

Convergent

Convergent

II. Sea-Floor Spreading

http://www.youtube.com/watch?v=GyMLlLxbfa4&feature=related

While you watch….look forHarry Hess

How did they find the mountain ranges?

Let’s watch it in action!

A. The Mid-Ocean

Ridge is the longest chain of mountains in the

world and are located on the

ocean floor.

: www.ocean.udel.edu

The Mid-Ocean Ridge system, shown above snaking its way between the

continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like

the stitching on a baseball!

This is a model of sea floor spreading at a divergent boundary called a mid ocean

ridge.

B. Sonar is a device that bounces sound

waves off underwater objects and then

records the echoes of these sound waves. Scientists use sonar to study the ocean

floor.

SONAR

Discovery of Sea-Floor Spreading

C. Evidence for Sea-Floor Spreading 1. The mid-ocean ridge forms along cracks

in the oceanic crust2. At the mid-ocean ridge, molten material

rises from the mantle and erupts. The molten material then spreads out, pushing older rock to both sides of the ridge

3. Sea floor spreading is the process by which new material is continually added to the ocean floor.

4. Several types of evidence is used to support sea-floor spreading – magnetic stripes, molten material, and drilling samples

Sea-Floor Spreading

m.y. means million years ago

Notice this compass.

Animation of sea floor spreading

Can you explain this diagram!?

As the sea floor spreads, the lava cools according to the magnetic poles at the

time. The rocks on the ocean floor have proved that the earth’s magnetic field

sometimes reverses. The inner core flips and so the north pole moves to the

southern hemisphere! The earth itself does not flip.

http://platetectonics.pwnet.org/img/blocks.gif

So, if the mid-Atlantic Ridge is getting new

crust….is the Earth getting bigger?

D. Subduction at Deep-Ocean Trenches1. Deep ocean trenches are where the

ocean floor plunges into deep underwater canyons. They are formed where the oceanic crust bends toward the mantle.

2. Subduction – process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle

3. At deep ocean trenches, subduction allows part of the ocean floor to sink back into the mantle, over tens of millions of years.

The PACIFIC ocean is where

most of the crust is getting

subducted back into the Earth. Here, there are lot of volcanoes

and earthquakes. It’s known as the

Ring of Fire!

Extra Info

Plate Tectonics vs. Continental Drift

Please, show me the rough

draft before you

start typing!!!!

Tier work time