17.3 - Plate Boundaries

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Divergent Boundaries

Regions where two tectonic plates are moving apart

What is a famous Oceanic-Oceanic Convergent Boundary?

The Marianas Trench

Where are most divergent boundaries found?

Along the seafloor in rift valleys

Divergent boundaries ... crust

Create

What are transform boundaries responsible for?

Earthquakes

What are divergent boundaries associated with?

High heat flow, volcanism, and earthquakes

Tectonic Plates

Huge pieces of crust and the rigid upper mantle that fit together at their edges to cover Earth's surface

What does the magma that rises from an Oceanic-Continental Convergent Boundary form?

It also produces a trench and volcanic arc but instead of islands, a chain of volcanoes form on the edge of the continental plate >>*Results in a mountain range with many volcanoes*

What does the magma that rises from an Oceanic-Oceanic Convergent Boundary form?

It forms an arc of volcanic islands parallel to the trench

Oceanic-Oceanic Convergent Boundaries creates ... ?

Ocean trenches, the crust is then melted and recycled

... crust is denser than ... crust

Oceanic, continental

What is a famous Oceanic-Continental Convergent Boundary?

The Andes Mountain Ranges

What is a famous Continental-Continental Convergent Boundary?

The Himalayas

What is a famous Transform Boundary?

The San Andreas Fault

What happens to the crust when a transform boundary occurs?

The crust is only deformed or fractured

What happens after a Continental-Continental Convergent Boundary occurs?

The edges of both plates become crumpled, folded, and uplifted

Explain how Continental-Continental Convergent Boundaries occur

The oceanic crust, already below (but towing the continental) the plate descends beneath the continental crust at the subduction zone -The continental plate being towed behind will not sink and will collide with the other contninental plate

What does water do for the subducting plate (in Oceanic-Oceanic Convergent Boundaries)?

Water carried in by the subducting plate lowers the melting temperature of the plate which makes it melt at shallower depths

Rift Valley

When continental crust begins to separate and a long, narrow depression occurs (might lead to a new ocean basin)

Mid-Ocean Ridge

When magma rising through a rift form a continuous mountain chain on the ocean floor

Convergent Boundaries

When two plates move toward each other

Oceanic-Oceanic Convergent Boundaries

Where subduction occurs when a denser oceanic plate descends under another oceanic plate

Oceanic-Continental Convergent Boundaries

Where the denser oceanic plate subducts under the continental plate

Subduction

Where the denser plate descends below the other, less-dense plate

Continental-Continental Convergent Boundaries

Where two continental plates collide

Transform Boundaries

Where two plates slide horizontally past each other


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