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13. How many tectonic plates can be identified on
Earth today?
15. The world’s last supercontinent is known as
not Vaalbara or Rodinia
over a dozen (over 12)
16. How many years ago did the supercontinent
Pangaea begin breaking up?
14. Where does old seafloor sink back into the Earth
to be recycled?
250 mya (million years ago)
subduction zones (or deep-ocean trenches)
17. As plates move across the Earth, crust and rock is
dragged back down into the Earth at what type of
19. The Himalaya Mountains formed as a result of
the collision of what two tectonic plates?
Indian Plate and Eurasian Plate
subduction zones
18. When continental crust collides with continental
crust at convergent plate boundaries and no
subduction occurs, what begins to form?
Eurasia = Europe + Asia