Terms in this set (11)
The process by which molten material adds new oceanic crust to the ocean floor
Sea Floor Spreading Evidence
A parallel pattern of rock material found at identical locations on each side of the Mid-Atlantic Ridge reveals rock of the same geologic age and polarity.
The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
A German scientist who proposed the theroy of continental drift
Measures the time it takes to detect the reflected sound waves
Proposed the theory of sea-floor spreading
Average ocean depth
The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
Steps of sea floor spreading
1) Magma erupts along the mid ocean ridge 2) lava hardens into pillow shaped rocks 3) old rocks are pushed further away from mid ocean ridge by newer rocks 4) subduction in some areas
a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle