earth science 05
Terms
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- what is sea floor spreading?
- the theory claiming that the mid-ocean ridge is a huge crack in the earths crust where the hot mantle pushes through and spreads the ocean floor apart.
- what is refraction?
- the bending of a wave caused by the by the change of speed that occurs when the wave moves from one medium to the other.
- what is relitive age?
- determining the age of a layer of sedimentary rock, or a fossil in such a layer, by comparing its position to other rocks layers around it.
- what is shear?
- type of stress where rocks in the earths crust are pushing in different horizontal directions.
- i MaDe ThIs A fReE oNe FoR yA!
- To GeT tO tHe OtHeR sIdE
- what is the richter magintude scale based on?
- the amout of shaking caused by an earthquake
- name the 3 types of seismic waves caused by an earthquake and describe each one.
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p (primary)-the fastest wave. travels by back and forth movement. can travle through water. squeezes and pulls rocks.
s (secondary)- slowest and arrives second at a seismic station. travels up and down. cannot travel through water.
L- most desctrutive type of wave is created when the P and S waves meet at the surface. - parts of a volcanoe
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crater- the steep hollowedout area surrounding a cent at the top of a volcanoe.
magma chamber- large pocket of magma
pipe- crack in crust where magma moves.
vent- where the magma emerges out of the vocanoe - the limit to how much stress a material can take
- elastic limit
- who invented the theory of contenental drift?
- alfred wegener
- thrust fault
- hanging wall moves up in relation to the footwall due to compression
- stress
- force that act on the rocks of the earth's crust causing movement of the crust or a change in the shape or volume
- subduction
- when one plate moves under another
- seismic wave
- shock wave in the earth caused by an earthquake
- normal fault
- a fault where the hanging wall moves downward in relation to the footwall
- prefixes used in SI
-
measurements unit symbol
kilo- 1,000 k
hecto- 100 h
deca- 10 da
deci- 1/10 d
centi- 1/100 c
milli- 1/1000 m
micro- 1/1000000 u - density=
-
mass
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volume - SI Based units
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measure unit/symbol
length meter/m
mass kilogram/kg
area spuare meter m2
volume liter/L
tempature degrees cel.
time seconds/s - moho
- boundary between the earths crust and mantle
- true or false istosatsy balances 2 forces
- true
- fissure
- large crack in the earth resulting from an earthquake
- independent variable
- changes the dependent variable
- infer
- to make a conclusion based on availiable data
- geological time
- time scale of the history of the earth and its life