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27 Cards in this Set

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Magma
is Melted Rock found underground
Lava
is magama which riches the earth's surface
Mafic
is thin and fast moving traps low % of gas, loqw amount of silica, dark colored rocks, forms sheild con
Felsic
is thick and slow moving traps high% of gas, contains high amount of silica, light colored rocks, forms cindercones
active
erupted recently or will erupet soon
dormant
a sleeping volcano that has been quiet for a long time but may still erupt
tephra
lava in solid fragments
bombs
tephra larger than 64 mm sand ejected as a liquid
blocks
tephra larger than 64 mm and ejected as a solid
lapilli
tephra between 2 and 64 mm
ash
tephra under 2 mm
shield
volcanos w/ broad gentle slpes and built by the eruption of fluid basalt lava
Cinder and Scoria
Straight sides with steep slopes and summit crater
Composite and
Steep and conical, formed by viscous lava flows, tephra and pyroclastic
Stratovolcano
erupted recently or will erupet soon
extinct
not erupted for thousand of years and will probably not erupt
earthquake
that results frextincom the sudden movement of part of the Earth's crust shaking
focus
point inside earth where the earthquarke starts
epicenter
point on Earth's surface directly aboce the focus
Seismic waves
earth quake waves; types include p s and l waves
seismograph
instrument which measures and records seismic waves
seismogram
paper that earthquake waves are recorded on
seismologist
scientist who studies earthquakes
richter scale
scale used to determine the strength or magnitude of an earthwuake. ranges 1 to 10.
L waves
surface or long wave, travel like waves in a ocean (rolling or circulation motion) last to hit sismograph, most visable damage
P waves
primary or compressionary wave, push- pull motion, travel through solid, liquid, gases, first to hit seismograph
S waves
secondary or shear wave, side to side motion, 2nd to hit sismograph, travel only through solids