Show:
Earth Composition
Continental Drifting
Plate Interactions
Igneous Rocks
Volcanoes
100
What is the name of the supposed supercontinent?
Pangaea
100
What margin pulls two oceanic plates apart? And what does this create?
Divergent; creates new sea floor
100
What is the difference between magma and lava?
Magma is underground; Lava is above.
100
What does silica do to mobility?
Slows it down
200
Which is thicker; Oceanic or Continental crust?
Continental
200
What are four pieces of evidence Wegener used?
Fossils, Fit of Continents, Rocks and Climates
200
What are the three types of Convergent boundaries?
Ocean to ocean, ocean to continent, and continent to continent
200
Why isn't obsidian classified with the dark rocks?
70% of obsidian is silica but ash creates it's dark shell
300
How do scientists learn about the layers of Earth?
Indirect Methods
300
Why we're Wegener's ideas discarded by his peers?
He could not explain how the continents moved.
300
What is the most well known transform boundary?
The San Andreas Fault
400
Which is hotter; the mantle or core?
The core
400
What are some direct methods we use now to study the continents movement?
Sonar, submersibles, dredging, drilling
400
Examples of vesicular rock
Scoria, pumice
500
What is the asthenosphere compared to?
Silly Putty
500
Define isostacy
The equilibrium between continental crust and the denser mantle below it.
500
What is andesite, intrusive or extrusive?
Both
500
What changes the lava?
Temperature, pressure and water content.