Movers and Earth-Shakers
Natural Borders
Moun-ten...nine...eight...
Land Expand
The Girth of Earth Dynamics
100
There was a clump of snow on the sidewalk. Elana stomped on it and felt it flatten. This type of stress is called what?
compression
100
Where are the youngest rocks on the ocean floor located?
at mid-ocean ridges
100
T or F. Older mountains have [rugged] peaks, and lower elevation.
F - smooth, or rounded peaks
100
What happens to the continental crust under a mountain as the mountain erodes and becomes less massive?
The continental crust becomes thinner and moves up to maintain isostasy.
100
What does subduction do?
takes rock into Earth where it will be melted
200
How does uplift contribute to the rock cycle?
It brings metamorphic and igneous rock to the surface.
200
The Great Rift Valley in Africa is located at what kind of plate boundary?
Divergent (plate) boundary
200
T or F. Folded mountains form as continental plates [pull apart].
False - collide
200
What is the difference between elastic and plastic strain?
Elastic strain causes temporary changes in rocks' shapes, while plastic strain causes permanent changes.
200
Elastic strain occurs under which conditions?
The rocks are strong, the stresses are small, and the rocks return to their original state
300
What process takes rock to the inside of Earth?
subduction
300
List two landforms that might occur at divergent plate boundaries.
Mid-ocean ridges, continental rifts
300
A ________ forms when two oceanic plates collide. hot spot, subduction zone, transform boundary and rift valley
subduction zone
300
What are the two types of vertical motion of Earth's crust called?
subsidence and uplift
300
What happens to the continental crust under a mountain as the mountain erodes?
It rises.
400
When does plastic strain occur?
When rocks are hot and weak
400
Active volcanoes are MOST likely to form at what kind of plate boundaries? What kind of plates are on either side of the boundary?
convergent oceanic-continental boundaries
400
What type of mountains are formed when molten rock erupts onto Earth's surface and hardens?
volcanic mountains
400
Up : Down :: Tension : ________
Compression
400
white : black :: deposition : __________
erosion
500
What is isostasy?
It is the equilibrium between continental crust and the denser mantle below it.
500
The San Andreas Fault is an example of what kind of plate boundary?
Transform
500
Metamorphic rocks come to the surface on the top of mountains after ___________ removes other materials.
erosion
500
left : right :: basins : ____________
mountains
500
Compression : convergent boundary :: Shear : ________-
Transform boundary
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