CH25 Flashcards
mid-ocean ridge
a system of mountain ranges
rift valley
forms between peaks
convergent plate boundary
two plates collide
subduction
when a thick and a thinner plate hit
divergent plate boundary
boundary between two plates
transforms plate boundary
plates slid horizontally past each other
earthquake
is the sudden movement or vibration
fault
is a crack in the earths crust
elastic rebound
sudden release of strain energy
focus
the point of origin for an earthquake
epicenter
earths surface directly above the focus
who came up with the continental drift hypothesis
Alfred Wegener
What is some evidence for the continental drift
1: the coast lines matched up like a puzzle peace
2: mountain ranges with the same rock type
3: they found large animal bones
What was the super continent called
Pangaea
who came up with the sea floor hypothesis
Harry Hess
how did he discover sea floor spreading
sonar
who discovered the MOR-Mid Ocean Ridge
Hess
on the ocean floor where is the newer rock formed
Closer to the MOR
what are the types of plate boundary
Divergent plate boundary
Convergent boundary
Transform boudary
how do convergent plate boundary move
move together
subduction only happens with which type of plate boundary
convergent
what are the two types of crust
continental crust
oceanic crust
which type of crust has to be present for volcanic action
oceanic crust
if oceanic or continental crust come together what will form
deep sea trench
volcanos
what forms if two oceanic crust colid
deep sea trench
oceanic island
what do hot spots create
islands
