Chapter 7 Flashcards
the plate tectonics theory states that:
the Earth’s outer layer is made up of plates which have moved throughout Earth’s history
who first formed the continental drift theory
Alfred Wegener
the continental drift theory states that:
approximately 225 million years ago the continents were all one big supercontinent called Pangaea
continents developed when
plate movement occurred
a Mid Ocean Ridge (MOR) is:
a system of mountain ranges on the sea floor that are separated by valleys
Mid ocean ridges were discovered by
SONAR
mid-ocean ridges form through a process called
seafloor spreading
the three main types of plate boundaries are
convergent, Divergent, and transform
a convergent plate boundary is where
two plates collide
subduction, volcanic arcs, earthquakes, and continental collision (high folded mountains) are all the result of
movement at a convergent boundary
Continental Collision is
when plates of equal density Collide and do not subduct at a convergent plate boundary which form High folded mountain ranges where volcanic activity is absent and there is no deep sea Trench
a divergent plate boundary is where
two plates are moving apart
mid-ocean ranges and rift valleys form at
divergent boundaries
a transform plate boundaries where two plates
slide horizontally past each other in opposite directions
stress, fault lines, and earthquakes are caused
by transform boundaries
