chapter 25 Flashcards
Hess discovered a system of of mountain ranges on the sea floor separated by valleys
mid-ocean range
forms in between peaks along the mid ocean range
rift valley
boundary where two plates collide
convergent plate boundary
when a thick buoyant continental plate the denser the plate dives beneath the continent in a process called a
subduction
the boundary between two plates that are moving apart is called a
divergent plate boundary
type of boundary where plates slide horizontally past in opposite direction is called a
transform plate boundary
sudden movement or vibration of the ground that occurs when rocks slip and slide along enormous cracks in earth’s crust
earthquake
crack in earths crust along which rock has moved
fault
sudden release of strain energy as rock moves along a fault is called
elastic rebound
the point of origin for and earthquake is called a
focus
the point on earths surface directly above the focus is called the
epicenter
who came up with the continental drift hypothesis?
alfred wegener
what where some pieces that supported Alfred’s hypothesis?
large land animal fossils,coast lines matched up,mountain ranges matched up (had same rock composition and rock age)
what was the name of the super continent?
pangaea
who came up with sea-floor spreading hypothesis
Harry Hess
what did he use to help him create a map of the sea floor
sonar
who discovered the mid ocean range?
Harry Hess
where will younger rock be found on the bottom of the sea floor?
near the MOR
what are the three types of plate boundaries?
divergent,convergent,transform plate boundary
what are the two types are crust that are involved in plate boundary movement?
oceanic and Continental crust
what land forms can form from oceanic and continental crust
volcanoes and deep sea trench
what two land forms can be created when two oceanic crust collide?
hotspots
what land form is created when two continental crust converge
mountains
how do divergent plate boundaries move?
they move away from each other
