U3 L2

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Across
  1. 4. reversal When magma rises to the Earth's surface at a mid-ocean ridge, it flows out onto both sides of the ridge, gradually cooled by the seawater
  2. 5. current any movement of matter that results from differences in density may be vertical, ciccular, or cyclical
Down
  1. 1. the process by which one lithosphere plate moves beneath another plates as a result of tectonic forces
  2. 2. spreading the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.
  3. 3. tectonics a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle.
  4. 6. drift the gradual movement of the continents across the earth's surface through geological time.