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G6 Ch5 L3.2 Forces that Build the Land Pt. 2
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Why do so many island chains and island arcs form in the Pacific Ocean?
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Compare and contrast P-waves and S-waves.
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What are the 2 types of seismic waves and where do they travel?
Surface waves near earth's surface; body waves through the interior of earth.
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What is a seismograph and how does it help scientists?
An instrument that detects, measures, and records the energy of earthquake vibrations at a given location.
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What are dikes, laccoliths, and batholiths?
Magma hardened in vertical cracks across horizontal layers; dome-shaped cooled magma; large pockets of magma that reach deep into the crust.
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What are dormant and extinct volcanoes?
"Asleep"; never observed to erupt.
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What is magnitude and in what units is it measured?
The measure of the energy released during an earthquake; the Richter scale.
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How many seismograph stations are required to determine the epicenter of an earthquake? Why?
Three; seismogrpahs measure time for wave to reach them, but lack directionality.
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Other than magnitude, what metric of earthquakes do scientists measure? Using what scale?
Intensity; the Mercalli scale.
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What are the three types of volcanoes?
Cinder cone, shield, composite.
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