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Chapter 4
Term | Definition |
---|---|
CORE | EARTH'SCENTER, WHERE PRESSURE AND TEMP. ARE VERY HIGH |
MANTLE | THE SECTION OF EARTH'S INTERIOR THAT LIES ABOVE THE OUTER CORE AND HAS THE MOST MASS |
MAGMA | molten material beneath or within the earth's crust, from which igneous rock is formed |
PLATE TECTONICS | a theory of global tectonics in which the lithosphere is divided into a number of crustal plates |
CONTINENTAL DRIFT | the lateral movement of continents resulting from the motion of crustal plates. |
RIFT VALLEYS | a subsea chasm extending along the crest of a mid-ocean ridge, locus of the magma upwellings that accompany seafloor spreading |
ABYSSAL PLAINS | a large area of extremely flat or gently sloping ocean floor just offshore from a continent |
CONTINENTAL SHELVES | the sea bed surrounding a continent at depths of up to about 200 metres |
TRENCH | a system of such excavations, with their embankments |
FOLDS | to bend over upon itself |
FAULTS | a defect or imperfection; flaw; failing |
WEATHERING | the state of the atmosphere with respect to wind, temperature, cloudiness, moisture, pressure |
SEDIMENT | the matter that settles to the bottom of a liquid; lees; dregs |
EROSION | the act or state of eroding; state of being eroded |
GLACIERS | an extended mass of ice formed from snow falling and accumulating over the years and moving very slowly |
DELTA | the fourth letter of the greek alphabet |