CH 25 Flashcards
Mountain ranges on the seafloor separated by valleys.
mid-Ocean ridge
A long, narrow depression forms in between peaks along the mid-ocean ridge.
Rift Valley
The boundary where two plates collide
convergent plate boundary
the denser plate dives beneath the continent
subduction
boundary between two plates that are moving apart
divergent plate boundary
boundary where plates slide horizontally past each other in opposite directions
transform plate boundary
the sudden movement or vibration of the ground that occurs when rocks slip
earthquake
a crack in earths crust along which rock has moved
fault
sudden release of strain energy as rock moves along a fault
elastic rebound
point of origin for an earthquake
focus
point on earths surface directly above the focus
epicenter
who came up with the continental drift hypothesis
Alfred Wegener
what is some evidence of the continental drift
- The coast lines matched up like a puzzle piece.
- Mountain ranges with the same rock types
- large land animals
What was the name of the super continent
Pangaea
who came up with the sea floor spreading hypothesis
Harry Hess
how did he discover the sea floor spreading
sonar
on the ocean floor where is the newer rock formed
closer to the MOR
what are the three types of plate boundaries
- divergent plate boundary
- convergent plate boundary
- transform plate boundary
how do convergent plat boundaries move
move together
Subduction only happens with which type of plate boundary
Convergent plate boundary
what are the 2 types of crust do we have
- continental crust
2. oceanic crust
what do hot spots create
volcanic islands
how do divergent plate boundaries move
how do transform plate boundaries move
slide past each other
what is a convection current
- magma heats up, becomes less dense, and rises
2. magma cools, becomes more dense,and sinks
