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23 Cards in this Set
- Front
- Back
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till
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sediment deposited in direct contact with ice
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striation
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gravel we scratches left behind by moving ices
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erratic
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rocks that are in places that it should not be
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tillite
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a rock forme when glacial till is lithified
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continental drift
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an idea that the continents are moving
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metamorphic rock
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rock formed by the alteration of preexisting rock deep within Earth (but still in solid state) by heat, pressure and chemically active fluids
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moraine
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An accumulation of boulders, stones, or other debris carried and deposited by a glacier.
it is made of till |
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plate tectonics
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a theory which proposes that Earth's outer shell consists of individual plates that interact in various ways and thereby produce earthquakes, volcanoes, mountains and the crust itself
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echo sounding
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an instrument used to determine the depth of water by measuring the time interval between emission of a sound signal and return of its echo from bottom
V * T / 2 = |
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mid ocean ridge
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a continuous mountainous ridge on the floor of all the major ocean basins and varying in width from 500 to 5000 km (300 to 3000 miles) the rifts at the crests of these ridges represent divergent plate boundaries
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divergent plate boundaries
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a boundary in which two plates move apart, resulting in upwelling of material from the mantle to create new seafloor
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convergent plate boundaries
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where two plates move toward each other and the leading edge of one is bent downward
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subduction
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the process by which oceanic lithosphere lunges into the mantle along a convergent zone
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seafloor spreading
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a hypothesis first proposed in the 1960 by Harry Hess which suggest thatnew oceanic crust is produced at the crests of mid-ocean ridges
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convection
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density driven by heat
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slab pull
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a mechanism that contributes to plate motion in which cool, dense oceanic crusts sinks into the mantle and pulls the trailing lithosphere along
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slab suction
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one of the driving forces of plate motion which arises from the drag of the subducting plate on the adjacent mantle
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ridge push
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a mechanism that may contribute to plate motion it involves the oceanic lithosphere sliding down the oceanic ridge under the pull of gravity
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plate tectonics
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theory that the Earth's surface is made of a series of plates (called lithosphere plates) these plates are created, moved, and destroying plate boundaries
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regional metamorphism
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- temperature and pressure related
- tectonic related via collision or orogenesis |
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high pressure metamorphism
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- increase pressure
- tectonic related via subduction |
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contact metamorpishm
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- locally increased temperature
- e.g magma intrusion |
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hydrothermal metamorphism
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- hydrothermal metamorphism
- hot chemical rich fluids - mid ocean ridges |
