earth unitreview
TRANSCRIPT
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EARTH SCIENCE REVIEW
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DIFFERENCE BETWEEN CONSTRUCTIVE AND DESTRUCTIVE FORCES
Constructive forces build up the earth’s surface
Destructive wear away earth’s surface
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LAYERS OF EARTH
Lithosphere- consists of crust and top of mantle Separates into plates Meets at plate boundaries
Asthenosphere- located under lithosphere; what the lithosphere glides on top of
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PANGEA
All the continents were once joined together in a super continent
Continents fit together like puzzle pieces
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SEA FLOOR SPREADING
Two oceanic plates moving away from each other (diverging)
The ocean floors move like conveyor belts, moving the continents away from each other
New crust is formed where the plates are spreading
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SEA FLOOR SPREADING AND PLATE TECTONICS
Convection currents is the engine that drives the plates to move
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TYPES OF PLATE BOUNDARIES
Convergent Divergent Transform
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WHAT HAPPENS WHEN PLATES COLLIDE?
Oceanic/Oceanic- the older plate (more dense plate) will subduct
Oceanic/Continental- oceanic plate subducts because it is more dense
Continental/Continental- forms mountain ranges
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DEFORMATIONS CAUSED BY STRESS
Anticlines Synclines Plateaus
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TYPES OF FAULTS
Strike- Slip Fault Reverse Fault Normal Fault
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FOCUS AND EPICENTER
Focus- point BENEATH Earth’s surface where rock under stress breaks to cause an earthquake
Epicenter- point on the surface directly above the focus
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SEISMIC WAVES
P Waves- compress and expand the ground like an accordion (happen first)
S Waves- vibrate from side to side and up and down
Surface Waves- when waves reach the surface (cause most damage)
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SCALES FOR MEASURING EARTHQUAKES
Mercalli Scale- rates earthquakes based on damage
Richter Scale Moment Magnitude scale
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RISK FACTORS FOR EARTHQUAKES
Shaking Liquefaction Aftershocks Tsunamis
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DEVICES TO MONITOR AND DETECT EARTHQUAKES
tiltmeter
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WHERE DO VOLCANOES FORM?
Convergent boundaries Divergent boundaries Hot spots
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TYPES OF VOLCANOES
Composite Shield Cinder cone
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PARTS OF A VOLCANO
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ACTIVITY OF VOLCANOES
Active Dormant Extinct
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MAGMA AND LAVA
Magma is molten rock under the ground When magma reaches the Earth’s surface, it
is called lava
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SILICA AND MAGMA’S VISCOSITY
Silica determines viscosity The more silica, the more viscous a
substance is More silica magma is light colored and is too
sticky to flow far Less silica magma flows readily and produces
dark colored lava
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HOW DOES TRAPPED GAS EFFECT A VOLCANO’S ERUPTION?
As magma rises toward the surface, the pressure decreases and the dissolved gases begin to expand and exert an enormous force