Class terms/notes after quiz 4 Flashcards
(39 cards)
What is the structure of Earth’s interior? (Top to Bottom)
Crust
Mantle (2500 KM)
Outer Core (5100 KM)
Inner Core (6300 KM)
How solid is the Mantle?
Semi Solid
What is the outer core made of?
Liquid (rock and metal)
What is the inner core made up of?
Solid (metal and rock)
Land areas are where crust is ____ dense.
Less
Is Ocean crust more or less dense than Land area?
More
Crust ____ on the mantle and the mantle moves due to _____
Floats, Convection
Crust moves with the mantle at a ___ cm per year
Few
Plate tectonics describe what?
Movement of crust on top of the mantle
Plates describe sections of what?
Crust that move independently
What are plate boundaries?
Collision of plates of different density produce subduction of one plate destroying crust
Plates diverging produce what?
New crust from mantle material
Where do Earthquakes occur?
Along plate boundaries (faults)
What happens in a Slide Slip Fault?
Pressure builds on a fault due to mantle movement, eventually causing plates to snap into a new position
What is a reverse fault
One plate moves up relative to another
What is a normal fault
One plate moves down relative to another
What is the Richter scale?
Measures earthquake intensity and is a logarithmic scale meaning it increases in intensity from 3-4, 4-5, etc.
It represents a 10x increase in energy per 1 increase.
What is Seismology?
Measuring Earth’s interior using waves that propagate the earth
What is a seismometer?
Instrument used to measure waves through the earth
What are S waves?
Up/Down motion of surface
What are P waves?
Stretching/compression of earth’s surface, fast moving
How do you figure out distance an earthquake?
Measuring arrival time of P/S waves
How can you triangulate the location of an earthquake?
3+ seismometers
Where do Volcanoes occur?
Mostly along Plate boundaries
