Continental Drift
Who proposed the hypothesis of continental drift?
Alfred Wegener
When Earth's magnetic field points north we call it_______.
Normal Polarity
What type of plate boundary is present when two plates collide?
Convergent
What within the asthenosphere allows plates to move?
Convection currents
Explain how a convection current works.
Hot material rises because it is less dense. Cooler material sinks because it is more dense.
What clue is this an example of. The Caledonian Mountains in Europe and the Appalachian Mountains in North America.
Rock clues
When Earth's magnetic field points south we call it ________.
Reverse Polarity
What type of plate boundary is present when plates move away from each other?
Divergent
What are the collection of plate boundaries, earthquakes, and volcanoes in the Pacific ocean called?
Ring of Fire
Mountains, earthquakes and volcanoes
What clue is this an example of? South America and Africa look as though they can fit into each other.
Puzzle Pieces
How can we tell that Earth's polarity has changed?
What is one thing that all plate boundaries cause?
Earthquakes
What do we call a divergent boundary on land?
A rift valley
Where is the older crust in the ocean found?
Close to the coastlines
What clue is this an example of. Remains of land-locked organisms have been found oceans apart.
Fossil Clues
Yes
Do divergent boundaries only occur in the ocean?
No, they can occur on continents.
What type of movement occurs at a divergent boundary?
Ridge Push
Where is the younger crust in the ocean found?
Near the mid-ocean ridge
What clue is this an example of? Glacial grooves have been found on warmer continents such as Africa, South America, and Australia.
Climate clues
What type of plate boundary is present when plates slide past each other?
Transform
What does a divergent boundary in the ocean cause?
Seafloor spreading/mid-ocean ridge
What type of movement occurs at a convergent boundary?
Slab pull
What is one of Mr. Williams 3 favorite Thanksgiving dishes?
Broccoli casserole, stuffing, mashed potatoes