EAPS 111 Lab Exam 1
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22 Terms
Evidence to support plate tectonics
1. Continental Coastlines
2. Fossils
What about continental coastlines supports plate tectonics?
the shapes of South America and Africa's coasts are similar - they fit together like a puzzle
What about fossils supports plate tectonics?
1. The same fossils are seen across separate continents
2. The age of rocks are symmetrical across mid-ocean ridges
How are earthquakes distributed?
They are concentrated around plate boundaries and are located based on shifting tectonic plates
Characterize spreading centers (divergent boundaries)
New seafloor is generated
Characterize mid-ocean ridges
fresh magma comes up and crust is slightly raised
characterize subduction zones
old seafloor is recycled. The plates slip which results in earthquakes. Because material is pushed down, magma rises.
Transform plate boundaries
2 separate plates slide past each other generating earthquakes
layers of the earth
crust, mantle, core
How do body waves travel through the earth
travel deep into earth, faster, reflected within the earth
How do surface waves travel through the earth
only travel on the surface, spread, slower
How do S-waves react?
reflected
How do P-waves react?
Refracted
Two types of deformation
Brittle and Ductile
Brittle
Fault
Ductile
Fold
What are formed under temp and pressure?
Metamorphic rocks
hot and long =
ductile (fold)
cold and short =
brittle (fault)
How many mm in a cm
10 mm=1cm
Half-rate formula
Distance/time (km/ma)
Total Velocity Equation
1/2 rate x 2