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041422.CONTINENTAL DRIFT

Horizontales
The topmost layer of the mantle is made of extremely hot, soft ___.
New magma pushes the crust apart, causing the sea floor to spread___.
Molten ___ rises through the crack, cools, and forms new oceanic crust.
The old crust gets ___ in the mantle
Tectonic plates “___” on top of the top mantle layer.
Over millions of years, the continents ___ to their present-day locations.
__ Drift Theory states that all the continents were once together in a single landmass and have drifted apart from each other
This creates a slow-moving motion which carries ___ thousands of kilometers.
_____ layers in America matched with layers in Scotland.
Evidence: Fossils of ___ and plants were found on widely separated continents.
Scratches on rocks from ___ have been found in warm S. Africa.
___ of tropical plants have been found in the cold Arctic.
Verticales
Mid-ocean ridges form along a long___ in the oceanic crust.
1950s, new data from studies of the ___ floor provided an explanation of how continents moved.
the oceanic crust sinks down into the ___ and is melted.
Ocean Floor sinks into deep underwater canyons called oceanic___.
Pangaea existed roughly 225 ___ years ago.
The soft mantle rock rises, cools and sinks in giant ___ currents.
All continents were once together in a supercontinent called ___
Each mid-ocean ridge featured a deep ___valley in between the two ridges.
---- proposed the Theory of the Continental Drift.
The east coast of South America and the west coast of Africa fit together like a _____.
Mountains, called mid-ocean ___, were found in all oceans.
Rock types found in ___ matched rocks found in W. Africa.
Wegener's theory was not believed since he could not show ___, the continents drifted.