Plate Boundaries
What are the three types of boundaries?
Convergent, Divergent, and Transform
How does GPS work?
Sends signals to satellites that measure movement
Name the layers of the Earth from outermost to innermost
Crust, lithosphere, asthenosphere, mantle, outer core, inner core
Lithosphere and asthenosphere
What forms at the mid-ocean ridges
new crust
What are the names of the parts of a wave?
Crest, trough, amplitude, and wavelength
What is subduction?
When one plate goes underneath another
What does GPS stand for?
Global Positioning System
Which layer of the Earth is liquid?
The outer core
What pattern is seen at the sea floor
stripes of old and new crust
What is amplitude?
The height of a wave, measured from the crest or trough to the rest/zero line
Subduction only happens when this type of crust is there.
continental
How is GPS helpful to geologists?
Where do convection currents occur?
the mantle
How does this support plate tectonics?
Shows that plates are moving over time
Which scale measures the energy of an earthquake?
Richter
Why do most earthquakes happen at boundaries
Stress/energy builds as plates move
What are the two ways used to interpret GPS data?
Maps and graphs
Since the inner core is the hottest layer, why is it solid instead of liquid?
The extreme pressure
What causes the magma to rise at the ridge?
Convection Currents
Which scale measures the damage of an earthquake?
Mercalli
What type of crust always subducts and why
Oceanic crust, since it is the most dense
On the GPS graphs, in order from top to bottom, what are the direction pairs?
N/S, E/W, Up/Down
This layer of the Earth contains both rocks and magma
The Lithosphere
Describe what forms the stripes at the sea floor
The Earth's magnetic field switches over time.
Compare P, S, and surface waves
P = fastest through solids and liquids
S = slower through solids
Surface = slowest and does most damage