chapter 4 science Flashcards

0
Q

The oceanic ridge system

A

Consists if broad areas of shallower seafloor

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1
Q

Paradigm shift

A

A fundamental change in the way we think about something

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2
Q

Ridge system

A

Source of volcanic activity

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3
Q

Narrow deep oceanic trenches

A

Found in ocean basins

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4
Q

Where is the ocean floor the youngest?

A

Oceanic ridges

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5
Q

Where is the ocean floor the oldest?

A

Along the edges of the oceans

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6
Q

Decompression melting

A

Partial melting below oceanic ridges is a result of a reduction in pressure

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7
Q

Seafloor spreading

A

New oceanic lithosphere is being continuously formed along the ridge system by magma rising from below and as this occurs the existing rocks move away from the ridge

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8
Q

Divergent boundaries

A

Locations where tectonic plates move apart and new lithosphere is created

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9
Q

Convergent boundaries

A

Locations where tectonic plates move toward one another and where lithosphere may be consumed by the process of subduction

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10
Q

Transform boundaries

A

Places where slabs of lithosphere slide past one another

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11
Q

ocean continent boundaray

A

convergent boundries
subduction zones
causes melting and volcanism

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12
Q

ocean ocean

A

convergent boundiray

creates island arcs

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13
Q

Why do divergent plates occur?

A

Hot rising mantle rock causes the rocks to move apart

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14
Q

continent continent

A

contiental crust clogs a subduction zone, shorter and thicker

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15
Q

Pangea

A

Super continent

16
Q

why do they think pangea existed?

A

because animal fossils were found on separate continents