One, Two, Three, Four
The outer layer of the earth which is broken into many pieces called plates.
What is the crust?
A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
What is a plate?
You are most likely to find where two oceanic plates meet.
What are trenches?
Structures made by divergent boundaries.
What are Mid-Ocean Ridges?
The place where volcanoes are most likely to be found.
What are oceanic and continental convergent boundaries?
Where can old oceanic crust be found?
Where farther away?
-rock layers on coastlines of different continents match -same species of plant/animal fossils found on different continents separated by oceans -glacial ice in areas that are now located near the equator -salt/coal deposits (which only form in warm climates) found in areas with cold climates
What is evidence of continental drift?
molten material, magnetic stripes, drilling samples
What is evidence for sea-floor spreading?
The San Andreas fault in California and is an example of this kind of plate boundary.
What is a transform boundary?
Mountains found at divergent plate boundaries.
What are fault block mountains?
What two theories created the current theory of plate tectonics?
What are Continental Drift and Sea-Floor Spreading?
the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side
What is sea floor spreading?
Happens by molten material erupting and cooling.
What is the addition of new sea-floor?
This determines which plate comes out on top when plates collide.
What is density or the density of the plate?
The explanation for why tectonic plates move in different directions.
What are convection currents?
What would be found on either side of a mid-ocean ridge?
What are stripes of older and colder rock the farther away you go.
Wegener's theory of how mountains formed.
What is folding and crumpling?
A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
What is a deep ocean trench?
Subducting plates are an example of this kind of boundary.
What is a convergent boundary?