Lecture 5 Flashcards
Who is Alfred Wegener?
CREATED THEORY OF CONTINENTAL DRIFT
What was the name of Wegener’s supercontinent?
PANGEA
2 examples of evidence proving there was a supercontinent?
FOSSIL EVIDENCE ON CONTINENTS SEPARATED BY OCEANS
CONTINENTS FIT TOGETHER LIKE A PUZZLE
What are the differences between continental crust and oceanic crust?
OCEANIC CRUST: DENSE, COMPOSED OF BASALT
CONTINENTAL CRUST: LESS DENSE THAN OCEANIC CRUST, COMPOSED MAINLY OF GRANITE
What is the main element that makes up the mantle?
SILICATES
What is the composition of the outer core and inner core?
NICKEL AND IRON
What are the 3 types of plate boundaries?
CONVERGENT
DIVERGENT
TRANSFORM
Define a convergent boundary.
CONVERGENT PLATE BOUNDARY: 2 OR MORE PLATES COLLIDE
1 PLATE SLIDES BENEATH THE OTHER PLATE. THIS IS KNOWN AS SUBDUCTION
MOUNTAINS AND VOLCANOES FORM AT THIS BOUNDARY
Define a divergent boundary.
DIVERGENT BOUNDARY: PLATE BOUNDARY WHERE PLATES PULL APART
MID-OCEAN RIDGES FORM
SEAFLOOR SPREADING: NEW SEAFLOOR IS DEPOSITED AS OLDER SEAFLOOR MOVES AWAY
Define a transform boundary.
TECTONIC PLATES SLIDE PAST ONE ANOTHER
EX: SAN ANDREAS FAULT
HOT SPOTS
What is the subduction zone?
THE AREA WHERE ONE PLATE SINKS BENEATH ANOTHER
Where are the majority of Earth’s volcanoes located?
PACIFIC RING OF FIRE
What is an oceanic trench?
RESULT OF CONVERGENT BOUNDARIES-SUBDUCTION ZONES
A TRENCH MARKS THE POSITION WHERE A PLATE SUBDUCTS UNDER ANOTHER
What is the mid-Atlantic ridge?
LOCATED ON THE FLOOR OF THE ATLANTIC OCEAN
BETWEEN THE EURASIAN PLATE-NORTH AMERICAN PLATE AND THE SOUTH AMERICAN PLATE-AFRICAN PLATE
NEW SEAFLOOR IS DEPOSITED AT THE RIDGE
Give an example of a transform boundary.
SAN ANDREAS FAULT
