• Have a seat with your lab group and get out your papers that you completed in class yesterday.

• Today’s Schedule• 1. Review Yesterday’s Assignment• 2. Review for Ch. 7 Test

ESSAY QUESTION

• Explain what the theory of plate tectonics is, how it works, and how it is responsible for shaping the landforms on Earth’s surface.

• 15 MC• 8 Short Answer • 1 Essay

Inside the Earth• What does the inside of Earth look like?• Layers• How are the layers arranged?• By density• What happens to the temperature

and pressure as you travel into the center of Earth?

• Both Increase

Inside the Earth• How do we know so much about Earth’s

Interior?• Seismic waves from earthquakes• Seismic waves travel at different speeds and

directions as they pass through the different layers of Earth.

Restless Continents• True or False: The continents are always moving?• True• What is this called?• Continental drift• Who created the theory of continental drift?• Alfred Wegener

Restless Continents• What discovery helped prove Wegener’s theory?• Mid-ocean ridges• How did we discover mid-ocean ridges?• Better Technology/sonar

Restless Continents• What process happens at mid-ocean ridges to

help move Earth’s plates?• Sea-floor Spreading

The Theory of Plate Tectonics• The theory that Earth’s lithosphere are divided

_______ that move around on top of the ______.• Plates, asthenosphere

The Theory of Plate Tectonics• What is the main cause of plate movement?• Convection currents• How do convection currents work?• Core heats up molten rock making it less dense.

The molten rock rises up towards the crust, where it cools down. As it cools it gets more dense and begins to sink back down through the mantle. This cycle will repeat over time, gradually moving Earth’s plates.

• Flash Presentation

The Theory of Plate Tectonics• Two plates moving away from each other = ______• Divergent boundary• Two oceanic plates are spreading apart =________• Mid-ocean Ridge/Sea-floor spreading• Two continental plates diverging =________• Rift Valley

The Theory of Plate Tectonics• Two plates colliding with each other = _______• Convergent Boundary• Two continental plates colliding = ________• Mountains• Oceanic plate and Continental plate colliding=_____• Trenches, mountains, and volcanoes

The Theory of Plate Tectonics• At convergent boundary between a continental

plate and an oceanic plate what process will happen?

• Subduction• Why?• The oceanic plate is more dense, so it goes under

the continental plate.

The Theory of Plate Tectonics• What type of boundary forms when two

plates slip or slide past each other?• Transform Boundary• What disaster can be associated with

transform boundaries?• Earthquakes