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Matching rock types/ages on continent margins
How is Earth's magnetic field generated? - answer✔Produced by convection of liquid iron in the
outer core
The seafloor was mapped during and after WWII and revealed: - answer✔Abyssal plains
Mid-ocean ridges
Seamounts and guyots
Trenches
Fracture zones
what does seafloor rock (basalt) reveal about earths magnetic field - answer✔polarity reversals
are recorded in the rocks
where is new crust created - answer✔mid ocean ridges
what happens to old crust - answer✔destroyed/recycled at subduction zones
basalt - answer✔A dark, dense, igneous rock with a fine texture, found in oceanic crust
peridotite - answer✔Dense, dark igneous rock that makes up the mantle.
granite - answer✔A usually light colored igneous rock that is found in continental crust
nebular hypothesis of planet formation - answer✔the earth and sun formed from the same
cloud of dust and gas
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