Download Unit 3 Crossword

Earth Science 11
Name: ___________________________
Block: ______
Unit 3 Review – Plate Tectonics
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Around 1912, Alfred Wegener published his theory of _______.
Another word for "igneous intrusion".
A line of volcanic islands along a subduction zone.
Another word for "tephra".
An area of active volcanism away from a plate boundary.
A big igneous intrusion (pluton), but not big enough to be called a batholith. Surface area is less than
100 square kilometres.
Rocks deform and store energy, then the energy is released as rocks snap back into their pre-stressed
shape. This is called ...
We know the outer core is liquid because _______ are stopped.
First to arrive at any seismic station during an earthquake.
The location on the surface directly above the focus. (Canadian spelling)
A volcano formed from mafic lava flows, spreading over a large area.
Magma and/or lava that is rich in iron and magnesium. It flows easily.
Surface waves; these do the most damage during an earthquake.
Vibrations in the ground, caused by sudden movement in Earth's crust.
A measure of energy released during an earthquake; adjusted for distance.
An area that doesn't receive seismic waves from an earthquake because the waves have been blocked or
refracted by Earth's core.
A volcano formed when tephra piles up near the vent.
_______ currents in the asthenosphere drive plate motion.
A sheet of igneous rock which runs parallel to surrounding layers.
A plate boundary where plates slide past each other, like along the San Andreas Fault in California.
Magma and/or lava that is silica rich. It is thick and sticky, so it doesn't flow easily.
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Solid bits of lava ejected from a volcano.
The exposed remains of an eroded volcano; this is the rock which cooled inside the vent. Black Tusk,
near Whistler is an example.
The crust plus the uppermost mantle, making up tectonic plates.
Magma which solidifies into rock below the surface.
A really big igneous intrusion; forms the core of BC's Coast Mountains.
Rock which has solidified from lava erupted onto the surface.
Plates "float" on the _______, a portion of the mantle which behaves in a plastic manner.
Most earthquakes and volcanoes occur along _______.
Mt. Baker and Mt. St. Helens are both _______ volcanoes.
Another word for "extrusive", when talking about igneous rocks.
He was the first person to suggest that continents actually move.
A converging plate boundary where one plate is pushed beneath another.
The minimum number of seismic stations required to locate the epicentre of an earthquake.
A crack along which rocks move relative to one another.
Earth's surface is made of large rigid slabs that move relative to one another. This is a summary of
_______.
A sheet of igneous rock which cuts across surrounding layers.
A mushroom-shaped pluton (igneous intrusion).
Where plates are moving apart, they are said to be _______.
The point below the surface where an earthquake actually begins.
A valley formed when plates are moving apart.