Reforming the Earth

Plate Tectonics

Boundaries Earthquakes Volcanoes Random

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Solid, outer layer consisting of the crust and upper mantle

Answer

Lithosphere

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This type of crust has a low density made of silica rich rock

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Continental crust

Layer of plastic rock below the lithosphere

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Asthenosphere

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Dense crust made of iron and magnesium

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Oceanic crust

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What forms when oceanic lithosphere subducts

beneath oceanic lithosphere?

Answer

An Island Arc

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What is an undersea mountain range formed at a divergent boundary?

Answer

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Mid-ocean Ridge

What kind of boundary would from a mountain

range?

Answer

Convergent

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Boundary where 2 plates are moving

away from each other

Answer

Divergent

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Where are most divergent boundaries found?

Answer

On the ocean floor

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The San Andreas Fault is an example of this type of boundary

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Transform

What are 2 types of surface waves?

Answer

Love and Rayleigh

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Answer

What is an area where no direct seismic waves can Be detected?

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Shadow Zone

What scale do we use to describe the intensity of an

earthquake?

Answer

Modified Mercalli

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What is it called when rocks on each side of a

fault suddenly return to their undeformed shape?

Answer

Elastic Rebound

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What are the most damaging seismic waves?

Answer

Surface Waves

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When this molten rock solidifies beneath Earth’s surface, intrusive igneous

rock forms

Magma

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Magma that erupts onto Earth’s surface is called

what?

Answer

Lava

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Volcanically active area of Earth’s

surface commonly far away from a tectonic

plate

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Hot Spot

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This forms in the ocean where one plate is

subducted

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Trench

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Magma formed from an underwater volcano is called what?

Pillow Lava

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What is the supercontinent that formed 300 million

years ago?

Answer

Pangea

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What scales do we use to measure the magnitude of an

earthquake?

Answer

Richter and Moment Magnitude

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The point on Earth’s surface directly above the focus of an

earthquake

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Epicenter

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A large pluton that can cover an area as big as 100 km2 is a

_________

Answer

Batholith

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Devils Tower was caused by the cooling of magma within Earth’s crust until erosion

revealed it. What is this structure called?

Answer

A Pluton

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