Chap. 10; Sec. 1&2 mini quiz
Terms in this set (57)
Who proposed a hypothesis that is now called Continental drift?
What are the three types of plate boundaries?
Divergent, convergent and transform
Which boundary is between tectonic plates that are sliding past each other horizontally?
Which boundary is between tectonic plates are colliding?
Which boundary is between tectonic plates that are moving away from each other?
What were Wegener's four pieces of evidence to prove his hypothesis?
Fossil evidence, evidence from rock formations, climatic evidence and the fact that the continents fit together like a puzzle piece
What is the process by which new sea floor forms as magma rises to earths surface and solidifies at a mid Ocean Ridge?
What are the three causes of plate motion?
Convection, Ridge push, and slab pull
What is the area along a plate boundary where one plate moves under another plate called?
Why was Wegener's mechanism disproved?
The lack of a mound of rock and soil on one continent
Which is denser continental crust or oceanic crust?
What are the two types of polarity?
Reversed and normal
How do scientists identify locations of plate boundaries?
They use the locations of earthquakes volcanoes trenches and mid ocean ridges
Rock becomes less dense when it does what?
What is earth's source of heat?
What is a large area of stable rock called?
How many major tectonic plates are there?
As a plate subducts beneath another plate islands and other land features on the subducting plate are scraped off the subducting plate and become part of the overriding plate, what is this process called?
The process of accretion
What is one thing that continental change effects?
The current movements of ocean water
Laurasia became which two continents?
North America and Eurasia
Are younger mountains rounded, or jagged and steep? Are older mts rounded, or jagged and steep?
Younger: jagged and steep
What modern continents formed from Gondwanaland?
Africa, South America, Antarctica, Australia, and The subcontinent of India
Which is worse shallow earthquakes or deep earthquakes?
support for Wegener's hypothesis of continental drift includes evidence of changes in what?
New ocean floor is comes Tetley constantly being produced through the process known as........?
An underwater mountain chain that formed by seafloor spreading and is called a what?
A mid ocean ridge
Scientists think that the upwelling of mantle material at mid ocean ridges is caused by the motion of tectonic plates and comes from what?
The region along tectonic plate boundaries where one plate moves beneath another is called a what?
A subduction zone
The layer of plastic rock that underlies the tectonic plates is the what?
Two plates grind past each other at a.......?
Convection occurs because heated material becomes......?
Less dense and rises
The term tectonics comes from a Greek word meaning what?
The parts of the continents that are made up of formerly separate pieces of lithosphere are called what?
What is the geomagnetic reversal timescale?
Alternating normal and reversed polarity in the rocks
What is the crack in the ocean floor called, through which magma rises?
How does sediment that is closer to a mid oceanic ridge compare to sediment that is farther away?
The closer the sediment is to the ridge is younger, the farther away the settlement is the older
Wegener's hypothesis of continental drift was finally confirmed by what?
Evidence supporting seafloor spreading to
Tectonic plates can include what?
Both oceanic crust and continental crust
What is the Pacific ring of fire?
A zone of active volcanoes around the Pacific ocean plate
The Himalayan mountains were formed from a collision at where?
At the convergent boundaries of the Asian plate and the Indian plate
What is an example of a transform boundary?
San Andreas Fault in California
When is slab pull caused?
When force is exerted by the leading edge of a subducting plate
When is Ridge push caused?
When cooling rock sinks and the asthenosphere below it exerts a force on the rest of the plate and pulls it away from the ridge
When large terranes and continents collide, what do they form?
Major mountain chains
What are modern climates a result of?
The past movements of tectonic plates
What is the theory that explains why and how continents move?
What may frequent earthquakes in an area indicate?
Tectonic plate boundaries
What do scientist use to assign ages to seafloor rock?
The geomagnetic reversal timescale
What is the center of the mid oceanic ridge?
A rift valley
Where do deep ocean trenches form?
At convergent boundaries
Built up heat from the mantle that weakens lithosphere causes what?
What is the ancient continent that contains all the landmasses called?
magma that reaches the earths surface may form what?
Fault block, volcanic, and subducted mountains
What is the only mountain formed that adds new material to the earths surface?
What are tectonic movements generally measured in?
Centimeters per year
Ocean trenches form where an oceanic crust does what?
Collides with the continental crust
What should scientists listen to and consider?
New ideas rather than ignore them