GLY 1880 Topic 1
Unlock all answers in this set
Unlock answersquestion
The primary reason continental drift theory was initially (prior to 1968) rejected was
answer
A failure to explain how continental crust could move though ocean crust
question
This feature is where the North America Plate is sliding laterally past the Pacific Plate (transform plate boundary)
answer
San Andreas Fault
question
__________ is viewed as the developer of the theory of continental drift
answer
Wegener
question
According to the theory of plate tectonics, old oceanic crust is destroyed
answer
in deep oceanic trenches
question
As young seafloor moves away from a spreading ridge
answer
it cools and contracts, so the seafloor slopes down and away from the ridges
question
_________ is the name of the supercontinent of the late Paleozoic-Mesozoic comprising all of the present continents before breaking up
answer
Pangaea
question
The magnetic stripes (anomalies) of the seafloor
answer
all of these are true
question
What is the study of Earth's magnetic history called
answer
Paleomagnetism
question
__________ was comprised of South America, Africa, Madagascar, India, Australia and Anatartica
answer
Gondwana
question
The discovery of these features from the ocean basins was the key to the seafloor spreading hypothesis and unlocking the secrets of plate tectonics
answer
magnetic anomalies
question
________ refers to the force imparted on a tectonic plate by the gravity-driven subduction of a cold dense slab of lithosphere surronded by warmer asthenosphere, thus pulling the rest of the plate along as it descends into the asethenosphere
answer
slab-pull
question
A __________ plate boundary is a zone along which plates slide past one another and crust is neither produced nor destroyed
answer
transform fault plate
question
Sediment thickness decrease away from the Mid-Atlantic Ridge and reaches minimum thickness along the adjacent continental margins
answer
False
question
Oceanic _______ are the deepest regions of the ocean basins
answer
trenches
question
A _________ is where new crust is created as plates move apart
answer
divergent plate boundary
question
The __________ is the rigid outer later from the earth's surface down to the asthenoshpere
answer
lithosphere
question
Which of the following is flase about oceanic ridges such as the Mid-Atlantic ridge
answer
they have the thickest accumulations of oceanic sediment
question
Major zones of earthquakes occur near trenches where a zone of dipping shallow, intermediate, and deep earthquakes defines a _____ zone of seismicity
answer
Benioff Zone
question
Continental landmasses merged into this single landmass prior to the evolution of dinosaurs
answer
Pangaea
question
A __________ continental margin is one away that is not near a plate margin
answer
passive
question
The Himalayan Mts. and Tibetan Plateau were formed by collision of the
answer
Indian and Asian plates
question
The eastern boundary of the North American Plate is
answer
the Mid-Atlantic Ridge
question
Which of the following is NOT a former portion of Gondwana landmass
answer
Europe
question
Plate tectonics is driven by
answer
mantle convection, slab pull and ridge push
question
Earthquakes and volcanoes are more common around the Pacific than the Atlantic because of the subduction of lithosphere into trenches
answer
True
