ES Topic 4/Lesson 1 Quiz Review
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Why Atlantic Ocean is growing larger and Pacific Ocean is growing smaller.
The Atlantic Ocean has a spreading mid-ocean, the Pacific Ocean is subducting faster than the mid-ocean ridges can make new land.
Step 1 in creation of new seafloor material
Molten material flows upward in a crack in Earth's crust
Step 2 in creation of new seafloor material
Molten material hardens into solid strips of rock on both sides of the crack.
Step 3 in creation of new seafloor material
The ocean floor on both sides of the crack moves farther away from the mid-ocean ridge.
Step 4 in creation of new seafloor material
Ocean floor gradually becomes wider
Subduction areas
Reason Earth isn't expanding
Ocean trenches
Where subduction occurs
Evidence that supports Wegener's hypothesis
Similar fossils in different locations, tropical plants in locations that are now cold, similar coal deposits in different locations
Most complete hypothesis that Wegener made
All the continents were once grouped together and had drifted apart over time.
Form only when molten material hardens quickly in cold water
How pillow-shaped rocks provide evidence that volcanic activity is taking place
