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7th grade stuff > Plate Tectonic study guide > Flashcards

Plate Tectonic study guide Flashcards

1
Q

What is continental drift theory

A

The idea that continents move over time

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2
Q

What is a convergent boundary|CB

A

A location where two tectonic plates move toward each other and collide

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3
Q

CB: Oceanic-Continental

A

Volcanoes

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4
Q

CB:Continental-Continental

A

Mountains

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5
Q

CB:Oceanic-Oceanic

A

Volcanic Island Arcs

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6
Q

What is a divergent boundary| DB

A

Where two tectonic plates divide

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7
Q

DB:Continental-Continental

A

Rift Valleys

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8
Q

DB: Oceanic-Oceanic

A

Mid-Ocean Ridge

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9
Q

Transform boundaries

A

Where two plates slide past each other

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10
Q

Normal Fault

A

Form when rocks undergo tension.Rocks above the fault surface moves downward in relation to rock below the fault surface.

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11
Q

Reverse Fault

A

Form from compression forces.Rocks above a reverse Fault surface is forced up and over the rock below the fault surface

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12
Q

Strike-Slip

A

Produced by shear forces pushing rocks in somewhat opposite horizontal directions

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13
Q

Fossil

A

Prehistoric petrified organisms

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14
Q

Pangaea

A

Super continent where all the continents were once joined

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15
Q

Mid-Ocean Ridge

A

A divergent boundary where molten lava flows out of and creates seafloor spreading in the ocean.

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16
Q

Sea-floor Spreading

A

The making of new crust which spreads the ocean floor and recycles old crust to make more crust.

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17
Q

Deep-Ocean Trench

A

A steep trench made by convergent boundaries being the deepest part of the ocean.

18
Q

Subduction

A

When two plates collide and the denser one subducts under the less dense one it is colliding with

19
Q

Plate Tectonics

A

The theory that Earth sits and moves on plates

20
Q

Rift Valley

A

Valley made by divergent boundaries

21
Q

Plate

A

A sections of the earth that are always moving

22
Q

Panthalassa

A

All Ocean

23
Q

What did wegener think happens during continental drift

A

That a huge supercontinent Pangaea once broke up and moved to their current positions

24
Q

Why are the oldest parts of the ocean floor no older than about 200 million years old?

A

This is because during seafloor spreading old crust gets recycled through subduction

25
Q

How does the density of the oceanic crust differ from that of the continental crust? Why is this difference important?

A

The different densities of the oceanic and continental crust is that the oceanic crust is more dense because it is always being recycled while the older crust on continental is weaker and old. For this reason this is important, this make it so that subduction may occur for seafloor spreading

26
Q

What is the evidence Wegener used to think that continents moved

A

Fossils,Rock samples,climates, and landforms

27
Q

What force causes the movements of Earths plates

A

Convection Currents

28
Q

Rocks on either side of a ______ Fault slip pass each other with little up and down motion

A

Normal

29
Q

What do the magnetic bands on the seafloor indicate

A

This indicates how many magnetic reversals the Earth has experienced

30
Q

What evidence is there for plate tectonics

A

The geologic events that occur at plate boundaries such as earthquakes and volcanic eruptions

31
Q

What happens at subduction zones

A

Two plates come together of different densities and one sinks under the other and melts

32
Q

What is the creation of new crust at divergent oceanic boundaries called

A

Sea-floor Spreading

33
Q

What are the three main types of plate boundaries that exist

A

Convergent,Divergent, and Transform

34
Q

Which boundary is characterized by the creation of volcanic mountain ranges

A

Convergent boundaries

35
Q

What type of plate boundary exists in California along the San Andreas fault

A

Transform Boundary

36
Q

Which boundary is characterized by the creation of a mid-ocean ridge

A

Divergent Boundary

37
Q

The collision between the Indian plate and the Eurasian plate caused the formation of the himalayan mountain range

A

Continental-Continental

38
Q

The____ __ ____ is an area along the edge of the Pacific ocean where a large number of earthquakes and volcanic eruptions occur

A

Ring of fire

39
Q

A(n) _____ is a fracture or break in the rocks that make up Earths crust

A

Fault

40
Q

A(n) volcanic _____ ____ is a string of islands created from the volcanoes along a deep ocean trench

A

Island Arc

41
Q

Remember to study the…..

A

diagrams(especially the 10.3 notes)

7th grade stuff (6 decks)

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