Geo Practical 1
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where are divergent boundaries found?
- mid-oceanic ridges
- rift valleys
subduct or collide
what do convergent boundaries create?
- mountain ranges
oceanic boundaries have what kind of rocks?
continental boundaries have what kind of rocks?
slide past each other
what do transform boundaries create?
- gash-like scars
- sag ponds
- streams that turn at right angles
hot spots create:
- volcanoes away from plate boundaries
- tall but not steep sided
where are hot spots found?
what is a fault?
a break in rocks where movement occurs
What is the focus or hypocenter?
location on a fault where the earthquake begins (underground)
what is the epicenter?
location on the ground surface directly above the focus
What is a seismic wave?
- a wave of energy that is generated when an earthquake occurs
- can be surface or body waves
What is a body wave?
wave that travels through the interior of the earth
What is a surface wave?
a wave that can only travel through the lithosphere
What is magnitude?
the amount of energy released by an earthquake
What is intensity?
the amount of damage that affects human life
How are tsunami waves created? regular waves?
- major disturbance on ocean floor
What is the wave length of tsunami waves? regular waves?
What is the speed of tsunami waves in the open ocean? regular waves?
What is the amplitude of tsunami waves? regular waves?
What is the base of tsunami waves? regular waves?
- half of the wavelength
Where is the energy content of tsunami waves? regular waves?
What kind of motion do tsunami waves have? regular waves?
What is reflection?
the bouncing of waves off of a surface
What is refraction?
when waves bend around an island
What is run-up?
the max vertical height of a tsunami as it comes ashore
how do you find the period of a wave?
period= velocity/wave length
How is magma formed?
- reduced pressure
- introduction of water
- when hot materials approach the surface at hot spots
- grow in diameter
- calm eruptions
- produce mafic lava
- produce intermediate to felsic lava
- violent eruptions
- produce ash and pumice
- move debris long distances in a short period of time
- similar to wet concrete moving down a hill
- water-saturated debris flow
- aka mudflow
- volcanic rock and dense ash that is ejected from an exploding volcano
- moves at 200 mph
- warning sirens
- evacuation plans
- designate safe zones
- practice drills
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