Science Last Test!

Front 1

What Idea Did Alfred Wegener Propose in the year 1912?

Back 1

All the continents were once together and diftied through the seafloor to their present locations

Front 2

What Was The Name Of The SuperContinent?

Back 2

Pangea

Front 3

what Evidence Did Wegener Have About The Theroy Of Continental Drift

Back 3

Puzzlelike Fit Of The COntinents
Fossil Clues
Rock Clues
Climate Clues

Front 4

Why Was Wegeners Theory Not Accepted?

Back 4

He Did Could Not Explain How Why Or When A Great Froce Cold Have Moved The Continents

Front 5

What Proved Continents Where Drifting?

Back 5

Seafloor Spreading

Front 6

Explain Seafloor Spreading

Back 6

Ocean Crust was Younger Than Continent Crust

The closer you are to the mid ocean ridge, the younger the crust

paleomagnetic clues=magentic fields

Front 7

What are the four main layers of earth?

Back 7

crust mantle outer core innner core

Front 8

Crust

Back 8

thinnest layer. mostly granite 35 miles
ocean crust=5miles basalt

Front 9

mantle

Back 9

thickest layer rigid upper mantlr called asthenosphere solid

Front 10

Outer Core

Back 10

liquid.. iron and nickel

Front 11

Inner Core

Back 11

solid.. iron and nickel

Front 12

Convection currents

Back 12

in the asthenopshere. plates move creating continental drift

Front 13

Lithosphere

Back 13

plates

Front 14

The earths crust is broken into

Back 14

9 major and 6 minor sections

Front 15

plates

Back 15

oceans and continents on top of them

Front 16

convergent

Back 16

2 plates come together
compression
Ring of fire
subduction
creates oceanic trench
volcanic islands

Front 17

divergent

Back 17

2 plates seperate
tension
landforms:
riftvalleys-africa ireland
linear sea: red sea
mid ocean ridges- atlantic
volcanic islands-iceland

Front 18

transform

Back 18

two plates slide past each otheerr
shearing
earthquakes
san andreas (cali)

Front 19

continental to continantal convergent

Back 19

fold and fault block mountains

Front 20

hot spots-

Back 20

mantle melts plates above it. (hawaii) geysers and hotsprings (old faithful)

Front 21

earthquakes

Back 21

realease a tremedeous amount of energy when rocks break

Front 22

energy from moving plates is sent through earth in form of ____

Back 22

vibrations

Front 23

seiemic waves

Back 23

vibrations from focus

Front 24

___ ____ earthquakes per year

Back 24

100,000

Front 25

___% are in the ring of fire

Back 25

80

Front 26

earthquakes are cause by

Back 26

tension
compression
shearing

Front 27

earthquakes -divergent

Back 27

tension makes normal faults were rock layers slip downward

Front 28

earthquakes- convergent

Back 28

reverse faults rocks above the fault line push forward

Front 29

earthquakes-transform

Back 29

slip strike rocks pushed sideways

Front 30

focus

Back 30

actual location wehre rock layers break

Front 31

epicenter

Back 31

earthes surface directly above the focus

Front 32

3 types of seismic waves

Back 32

p s and l waves

Front 33

P waves

Back 33

primary waves move the fastest stratches and compressies material go through any material

Front 34

S Waves

Back 34

secondary waves slower then p waves twists material it travels through goes throgh solids

Front 35

L Waves

Back 35

long surface waves
most destructive makes ground rise and fall on travels on surface

Front 36

how do you locate an epicenter?

Back 36

using the arrival time difference between p and s waves, seismologists know the distance to an earthquake (makes a cirlce) 3 stations nessecary to pinpoint the transmission

Front 37

how do scientists know the interior of earth?

Back 37

by the way p and s waves travel through earth, s go through mantle (solid) s waves dont go throught outer core (liquid) changes of speed and direction

Front 38

magnitude

Back 38

strength of an earthquake

Front 39

seismogram

Back 39

measures magnetude horizontal and vertical

Front 40

richter scale

Back 40

how magnitude is measure open ended. every number is 10x stronger then the previous

Front 41

How many active volcanoes are there?

Back 41

600 many in ring of fire

Front 42

dormat

Back 42

volcanoes that are not currently active but could still erupt

Front 43

what are volcanoes a result of?

Back 43

plate techtonics

Front 44

mts st helen

Back 44

convergent

Front 45

most active volcano

Back 45

mt. kilauea

Front 46

three parts of a volcano

Back 46

crater, vent and magma vent

Front 47

basalt magma

Back 47

flows easily and produces quiet erupstions of lava

Front 48

graniite magma

Back 48

thick and hard to flow. )explosive eruptions of tephra)

Front 49

shield volcanoes

Back 49

eruptions of lava broad sides lava layers

Front 50

cincer cone

Back 50

thephra steep sides tephra layers

Front 51

composite

Back 51

layers of both tephra and lava alternate eruption moderate slope