Today: 1. Review notes for 3 min.2. Quiz for 4 min. m.socrative.com /52593/Real Name3. Introduce Plate Tectonics review the power point presentation at home (on Edmodo)! There will be a quiz next week

Homework: Hand in Answers to Question #2a.b.cTell Ms. Melanie your project group members.

Lab work: 1. Build 12 sugar cube houses. Stick them together with

Peanut Butter, Nutella, or margarine. Build each one on a piece of WAX paper.

2. Create Clay (Play Do) Soil Tray.

Warm Up Quiz: 4 minutes1. What is your name? __________

2. Which layer of the Earth is the densest?3. What are two differences between

Compositional Layers and Physical Layers?4. Earth’s Crust layer is also called the

___________.5. Which layer does the crust (tectonic plates)

move on?

Please sign your name and hand in

Or Complete on your cell phone!

Plate TectonicsPg. 202 – 213 in

Dynamic Earth textbook

Can you name all continents? What are they? With a partner, try to list as

many as you can.

Continents

Continents – Correct your work

Like continents, the Earth’s Crust is also divided into Continental plates.

How many continental plates are there?* main ones _______15

In1800, Alfred Wegener thought about this idea

Continents were once 1 land form (Pangaea)

They moved apart over time!

Evidence to support his hypothesis◦ Fossils found across the ocean on another

continent◦ Location of mountain ranges and rock formations

across the ocean, rocks are the same age◦ Tropical fossilized plants found in Arctic zones.

Continental Drift (<- Video)

Single landmass

Thought to exist 245 million years ago

Began to drift apart

Himalayas formed from Indian plate colliding with Eurasian plate.

Pangaea (< click for video)

Pangaea

The plates movedue to convectioncurrents in themantle.

Movement over time

Lava (magma) rises through the cracks in the oceanic crust.

It cools and forms new crust (lithosphere).

Mostly occurs in the sea.

Evidence:-Rock samples are young (not old)

- sea floor is not smooth, but rough with large trenches

Sea Floor Spreading

Sea Floor Spreading –> creates mid ocean ridges (new crust!)

WHY ISN’T EARTH GETTING BIGGER?

If new crust is being made…

Mid Ocean Ridge

Ocean Trenches: deep canyons in ocean floor

Older crust is sinking (subducting) into the asthenosphere at the same rate new crust is forming.

Ocean Trenches: Why isn’t Earth getting bigger?

Describes large scale movement of Earth’s lithosphere (by Convection in the Mantle)

Explains volcanoes, mountains, and earthquakes

Tectonic Plate: lithosphere is divided into rock pieces

Plates move on asthenosphere in different directions and speeds.

Theory of Plate Tectonics

Tectonic Plates:

Click above fora short video!

Most crustal changes occur at plate boundaries

3 main types: *Divergent (Drift Apart) *Convergent (Come Together) *Transform (Sliding)

Plate Boundaries

2 plates move away from each other Sea floor spreading, mid ocean ridge is

created (if 2 oceanic plates). New crust is created

Divergent

Occurs when 2 plates collide. 2 continental plates colliding = mountains 2 oceanic plates colliding = ocean trenches

(subduction) Ocean and continental plate colliding = oceanic

plate subducts continental plate. Volcanoes occur.

Convergent Boundary:

2 plates slide past each other horizontally Ex: San Andreas Fault in California (USA) Sudden movement becomes earthquakes

Transform

http://ees.as.uky.edu/sites/default/files/elearning/module04swf.swf

Click the above link to watch pangaea unfold. Look at where volcanoes and earthquakes

commonly occur. Find the plate boundaries and note the

countries on them. Where is Thailand? Is there a connection between land

formations (mountains, volcanoes, earthquakes) and plate boundaries?

Interactive Map:

1. What theory did Alfred Wegner form in the 1800s?

2. What was the single landmass called that broke apart 245 million years ago?

3. What happens at Divergent boundaries?

4. Give 2 pieces of evidence for Continental Drift.

5. If the sea floor spreads and new crust is created, why isn’t the lithosphere getting bigger?

Quiz

He formed the theory of Continental Drift.

It was called Pangaea.

Plates move apart. In the ocean, the is called sea floor spreading. New crust is formed.

1. Rocks the same age were found on both sides of the ocean.2. Tropical plants were found in Arctic zones.

Some oceanic plates are subducting continental plates at Convergent boundaries.The oceanic plate is being destroyed in the asthenosphere.