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science chap 8

science chapter 8 definition quiz

Earthquake when energy is released suddenly by the actions of rocks breaking or moving, the moving that follows causes vibrations
fault when rocks are pulled apart and change shape
strike slip fault when rocks are compressed into a new shape
seismic waves earthquake waves moving throughout the earth
primary and secondary waves travel in all directions through the earth's interior
surface waves travel at shallow depths and along the Earth's surface; makes most damage
focus the point inside the earth where the wave movement first occurs; energy is released
magnitude the amount of energy released by an earthquake
epicenter the point on earths surface directly above the focus
seismograph instrument used to obtain a record of seismic waves
Richter scale describes how much energy an earthquake releases
tsunamis seismic sea waves that when they approach land and encounter the bottom of the sea floor, can be as much as 30 meters high
seismic safe when a building will be able to stand up against the vibrations caused by most earthquakes
volcanoes cone shaped mountain can spew gas, magma, and solids during an eruption
lava liquid hot rock that comes out of the earth
craters the circular holes near the top of the summit of a volcano
subduction when an oceanic crust and mantle collide
pyroclastic flow massive avalanches of hot glowing rock on the side of a volcano
volcanic risk map map used to show inhabitants about unsafe areas around a volcano
ballistic lava flows in broad flat layers
shield volcano the buildup of ballistic layers form this type of volcano with slightly sloping sides
cinder cone volcano small cone of volcanic material
tephra rock fragments ejected by a volcano
composite volcano steep sided mountains composed of alternating layers of lava and tehra
rifts long cracks that form between tectonic plates at divergent plate boundaries
basalt most abundant type of rock on earths surface
hot spots large bodies of magma are forced upward through earths mantle and crust
pacific ring of fire about 80% of all earthquakes occur in this area
Created by: beccawalk