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Science Chapter 1: Plate Tectonics
Terms in this set (49)
Scientists think that Earth formed ___________ billion years ago.
What are Earth's layers?
core, mantle, crust
The lithosphere is the Earth's crust and the top part of the _________.
The inner core is a ball of hot, solid _________.
There are two types of crust. What are they?
What is Earth's thickest layer?
The outer core is a layer of ________ metals.
The asthenosphere is a layer of hotter, soft ______.
What is the lithosphere broken into?
Tectonic plates are many large and small ______ of rock.
Tectonic plates fit together like what?
Who is the German scientist that studied over the theory of plate tectonics?
Wegener had a hypothesis called __________ drift.
_________, climate, and geology were evidences of continental drift.
Wegener's best evidence for continental drift is what?
Pangaea is a huge __________.
Pangaea split apart __________ million years ago.
Huge underwater mountain ranges are called
Sea-floor spreading, age of the sea floor, and _________ ___________ are all evidences from the sea floor.
Tectonic plates rest on what?
Energy transfer by the movement of a material is called __________.
In a convection current, there is a cycle. The hot, soft rock rises, cools, and _______, then is heated and rises again.
A motion that transfers heat energy in a material is what?
Slab pull and _______ push help move plates.
Scientists combine their knowledge of Earth's plates, the sea floor, and the ______________ to develop the theory of plate tectonics.
True or false: Eurasian is a name of one plate.
True or false: The three types of boundaries are dividing, convergent, and transfer boundaries.
In the ocean, divergent boundaries are also called what?
Mid-ocean ridges mark sites where the ocean floor is _________ apart.
A rift valley is a ______.
True or false: Mid-ocean ridges are the shortest chain of mountains on Earth.
What is the world's longest ridge?
True or false: Earth's magnetic and geographic poles are in the same place.
True or false: A magnetic reversal is a switch in direction.
Like the sea floor, continents also spread apart at a _____________ boundary.
Hot spots are heated rock that rises in _________, or thin columns.
True or false: Hot spots occur close to plate boundaries.
Subduction is when one plate _______ beneath another.
The three types of convergent boundaries are continental-continental collision, oceanic-ocean subduction, and __________________________ ____________
Do convergent boundaries move apart?
Do divergent boundaries move apart?
In continental-continental collision, two plates carrying continental crust _______ together. Both crusts are the same density, neither plate can sink beneath the other.
An oceanic-oceanic subduction occurs when one plate ________, or subducts, under another plate.
What are the two main features that form at oceanic-oceanic subduction?
Deep-ocean trenches, island arcs
An oceanic-continental subduction is where _________ crust sinks under _________ crust.
At oceanic-continental sites, what forms along with coastal mountains?
A transform boundary is neither formed or ___________.
As plates move apart, what happens?
new crust is forming
The theory of tectonic plates helps scientists ____________ what's in the future.
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