1. Homework: Hand in Answers to Question #2a.b.c
Tell Ms. Melanie your project group members.
Build 12 sugar cube houses. Stick them together with
Peanut Butter, Nutella, or margarine. Build each one on
a piece of WAX paper.
Create Clay (Play Do) Soil Tray.
2. What is your name? __________
2. Which layer of the Earth is the densest?
What are two differences between Compositional
Layers and Physical Layers?
Earth’s Crust layer is also called the ___________.
Which layer does the crust (tectonic plates) move
Please sign your name and hand in
Complete on your cell phone!
3. Pg. 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.
5. How many continental plates are
there?* main ones _______
In1800, Alfred Wegener thought about this
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.
Thought to exist 245
million years ago
Began to drift apart
Himalayas formed from
Indian plate colliding with
The plates move
due to convection
currents in the
Lava (magma) rises through the cracks in the
It cools and forms new crust (lithosphere).
Mostly occurs in the sea.
-Rock samples are young (not old)
- sea floor is not smooth, but rough with
Ocean Trenches: deep canyons in ocean floor
Older crust is sinking (subducting) into the
asthenosphere at the same rate new crust is
Describes large scale movement of Earth’s
lithosphere (by Convection in the Mantle)
Explains volcanoes, mountains, and
Tectonic Plate: lithosphere is divided into
Plates move on asthenosphere in different
directions and speeds.
13. Click above for
a short video!
Most crustal changes occur at plate
3 main types:
*Divergent (Drift Apart)
*Convergent (Come Together)
2 plates move away from each other
Sea floor spreading, mid ocean ridge is
created (if 2 oceanic plates).
New crust is created
2 plates slide past each other horizontally
Ex: San Andreas Fault in California (USA)
Sudden movement becomes earthquakes
Click the above link to watch pangaea unfold.
Look at where volcanoes and earthquakes
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?
What theory did Alfred Wegner form in the
1800s? He formed the theory of Continental Drift.
What was the single landmass called that
broke apart 245 million years ago?
It was called Pangaea.
3. What happens at Divergent boundaries?
Plates move apart. In the ocean, the is called sea floor spreading. New crust is
4. Give 2 pieces of evidence for Continental
1. Rocks the same age were found on both sides of the ocean.
2. Tropical plants were found in Arctic zones.
If the sea floor spreads and new crust is
created, why isn’t the lithosphere getting
Some oceanic plates are subducting continental plates at Convergent boundaries.