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Plate Tectonics (Chapter 3)

Name:________________________
Class: ___________ Date: ________
Across
The Earth's plates move very ______, from about 1-12 centimeters per year.
The pieces of Earth's cracked lithosphere are called ______.
Where two plates meet.
A ______ is any trace of an ancient organism that has been preserved in rock.
A _____ boundary is where two plates slip past each other, moving in opposite directions.
Fossils of Glossopteris, a ______ like plant, have been found on landmasses now separated by oceans.
Scientists have found rocks shaped like ______ that only form when molten material hardens quickly after erupting under water.
Scientists have found from drilling samples that the further from the mid-ocean ridge a rock sample was taken, the _____ the rock was.
The force that moves Earth's plates is the ______ currents of the mantle.
New crust is added to the ocean floor by a process called sea-floor ______.
Wegener's hypothesis was rejected because he couldn't explain the _______ that pushes or pulls the continents.
The ocean floor is mapped using _____, a device that uses sound waves to measure the distance to an object.
Wegener used evidence of ____ change to support his hypothesis, for example fossils of tropical plants found on an Arctic island.
Part of the ocean floor sinks back into the mantle at deep-ocean _______.
________ published his evidence for continental drift in a book called "The Origin of Continents and Oceans".
Down
Most divergent boundaries occur along the mid-______ ridges.
Gravity pulls the older, _______ oceanic crust down beneath the trench and back into the mantle.
When an ocean plate collides with a continental plate, the mantle may partially melt and rise up as magma to form _______.
The long chains of mountains that rise up from the ocean floor are called the mid-ocean _______.
_______ are breaks in the Earth's crust where rocks have slipped past each other.
The theory of plate _______ states that Earth's plates are in slow constant motion.
The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again is called ________.
When two continental plates collide, the collision squeezes the crust into high ______ ridges.
Plates may come together or _____.
The idea that the continents are slowly moving over the Earth's surface is known as continental _____.
Evidence for continental drift included fossils of freshwater _____ found in places now separated by oceans.
When plates move apart, they are said to ______.
_______ crust is more dense than the continental crust.
______ is the name of the supercontinent, or single landmass when all the continents were joined together.
Where pieces of Earth's crust diverge on land, a deep valley called a ______ valley forms.
Evidence of sea-floor spreading includes mirror image patterns of magnetic "_____" on each side of the ridge.