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31 Cards in this Set
- Front
- Back
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The continental crust is deepest beneath...
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Mountains.
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Oceanic crust is...
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Thinner and more dense than continetal crust.
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About 80% of Earth's volume is made up of...
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Mantle.
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Earth's inner core is...
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Hot and solid.
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Earth's lithosphere is composed of...
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The crust and the upper portion of the mantle.
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One hypothesis states that plate movement results from convection currents in the...
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Asthenosphere.
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A geogolic feature of dibergent plate boundaries in oceanis crust is the formation of...
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Rift valleys.
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A divergent boundary occurs when two plates...
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Move away from eachother.
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A zone where oceanic crust dives beneath continental crust is called a zone of...
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Rifting.
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A convergent boundary occurs where two plates...
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Move toward eachother.
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A transform fault boundary occurs where two plates...
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Move past eachother.
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The reversal of Earth's magnetic poles, as indicated by the rock on the ocean floor, occurs on average every...
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200,000 years.
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Earthquakes occur mostly...
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At plate boundaries.
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The breakage of rocks along a fault line releases energy in the form of...
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Seismic waves.
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What is NOT a charcteristic of S waves?
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Travel through solids and liquids.
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Waves that cause the most damage during an earthquake are...
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Surface waves.
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A seismograph measures...
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How much the surface of Earth moves during an earthquake.
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The minimum number of seismograph stations necessary to determine the location of an earthquake's epicenter is...
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Three.
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Scientists can calculate the distance from the seismograph station to the focus using...
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The difference in arrival times of P and S waves.
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The magnitude of earthquakes is expressed using...
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The richter scale.
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The magma released from volcanoes is rich in...
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Molten rocks from the mantle and crust.
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The magma of sheild volcanoes is rich in...
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Magnesium and Iron.
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A cinder cone volcano is caused by...
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Large amounts of gas trapped in the magma.
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The principal of superposition is used to...
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Determine the absolute age of rocks.
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Radioactive isotopes are used to...
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Determine the absolute age of rocks.
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Weathering that does not alter the chemical compisition of the rock is called...
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Physical weathering.
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The most effective agent of physical weathering and erosion is...
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Water.
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The process in which sediment is laid down is called...
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Deposition.
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Carbonic acid dissolved in water is a...
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Chemical waethering agent.
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Underground limestone caves form...
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When the calcite is dissalved by carbonic acid in rainwater.
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Rain is naturally...
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Slightly acidic.
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