How do convection currents form? a. heated mantle material is less dense and rises to the top of the asthenosphere b. mantle material cools under the lithosphere, becomes more dense, and sinks c. seismic waves act like a big spoon and stir up mantle material d. both a and b are correct

What did one mountain say to the other after the earthquake? “It isn’t my fault”

10 pts Each

Individual and Group

When I say transform you say Slide

Transform

When I say Divergent you say Apart

Divergent

When I say convergent you say Collide

Convergent

 A convergent boundary is where two plates come together, or converge. The result of the plates hitting together is called a collision.

a. Continental crust to continental b. Continental crust to oceanic c. Oceanic crust to oceanic

from: a. Continental crust to continental crust Example: India-Asia (Himalayas ) Before collision After collision

Indian plate (continental crust) running into Eurasian plate (continental crust) Indian plate Eurasian plate

Folded mountains – notice the rock layers

SUBDUCTION

The process by which the ocean floor sinks beneath a deep- ocean trench and back into the mantle is called

Oceanic crust is MORE DENSE than Continental!

Because one plate gets pushed under another, it is called subduction. This is where volcanoes and trenches form! all from:

Volcanoes form where a convergent boundary occurs between oceanic crust and continental crust.

South American plate (continental crust) running into Nazca plate (oceanic crust)

SUBDUCTION

Volcanoes also form where a convergent boundary occurs between oceanic crust and oceanic crust.

Aleutian islands of Alaska are volcanoes formed by oceanic crust converging with oceanic crust

Following volcanic islands in the Pacific Ocean can show us where oceanic crust is being subducted by oceanic crust.

 The place where two plates move apart or diverge is called a divergent boundary.

Can you explain this diagram!?

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

Oceanic crust diverging from oceanic crust

Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge? : 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!

Continental crust diverging from continental

African rift valley

Iceland’s rift valley

A transform boundary is a place where two plates slip past each other, moving in opposite directions.

San Andreas Fault in California

TIER 2 Reminders: 1. Make sure you are following the rubric! 2. Typed or written in blue/black ink 3. If you want me to look at it, I will! 4. Model=you should have three 5. Script=should be at least two pages 6. Let you me know if you need help!!!!!!!!!!