Ch8 iScience Vocab.

20 terms by Epikness77

Create a new folder

Advertisement Upgrade to remove ads

earthquake

shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity

fault

(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other

sesimic waves

energy from inside earth

focus

The point beneath Earth's surface where rock breaks under stress and causes an earthquake

epicenter

the point on the Earth's surface directly above the focus of an earthquake

primary waves

waves that travel outward from an Earthquake's focus and cause particles in rocks to move back and forth in the same direction the wave is moving

secondary waves

waves that travel outward from an earthquke's focus and move through Earth by causing particles in rocks to vibrate at right angles to the direction of the wave

surface waves

waves of energy that reaches Earth's surface during an earthquake, travel outward from the epicenter, and move rock particles up & down & side to side

seismologist

a scientist who studies earthquakes

seismometer

Instrument used to measure horizontal or vertical motion during an earthquake.

seismogram

the record of an earthquake's seismic waves produced by a seismograph

volcano

a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt

magma

molten rock in the earth's crust

lava

rock that in its molten form (as magma) issues from volcanos

hot spots

areas of volcanic activities that result from plumes of hot solid material that have risen from deep inside earths mantle

shield volcano

a wide, gently sloping mountain made of layers of lava and formed by quiet eruptions

composite volcano

volcano built by alternating explosive and quiet eruptions that produce layers of tephra and lava; found mostly where Earth's plates come together and one plate sinks below the other

cinder cones

Form when lava is thick and stiff and has a cone-shape.

volcanic ash

sand-sized particles of igneous rock that form when a spray of liquid magma is blown from a volcanic vent by escaping gas

viscosity

resistance of a liquid to sheer forces (and hence to flow)

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set