PLATE BOUNDARIES

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An american geologist

Harry hess

When was seafloor spreading theory proposed

1960's

Coined the term "seafloor spreading"

Robert S. Dietz

New oceanic crust is formed at mid ocean ridges and spreads outwards, pushing older crust away from the ridge.

Sea floor spreading

A deep canal in the ocean floor

Trench

meaning of SONAR

Sound Navigation and Ranging

Uses longitudinal waves to find and identify objects in the water

SONAR

Region between an oceanic trench and the associated volcanic arc found in convergent margins

Forearc

A.K.A destructive plate boundary

Convergent Boundaries

It occurs when two plates push against each other

Convergent Boundaries

areas where tectonic plates dive beneath other plates into earth's interior

Subduction zones

100km before subducting plate heats up

Depth of earthquakes

Two seismologist

Kiyoo Wadati and Hugo Benioff

Three Convergent Boundaries

Oceanic to Continental Convergence Oceanic to Oceanic Convergence Continental to Continental Convergence

Sierra madre mountain range, Andes Mountains and Cascade Range

Oceanic to continental convergence

Trenches, The arc of volcanic islands

Oceanic to Oceanic Convergence

Zone of kountains - The himalayas

Continental to continental Convergence

A.K.A constructive plate boundary

Divergent Boundaries

It occurs when two plates move apart from each other

Divergent Boundaries

This plate is characterized by tensional stresses that normally produce long rift zones, normal daults, and basaltic volcanism

divergent Boundaries

A.K.A conservative plate boundary

Transform Boundaries

Two plates slide horizontally past one another

Transform boundaries

These are generally vertical and prallel to the direction of movement. They are produced by sharing and are closely related to Divergent plate boundaries on the ocean floor

Transform Boundaries

Pccur in the ocean floor

Fracture zones

When on land

Faults

Three types of transform plate boundaries

Ridge-Ridge transform Ridge-Trench transform Trench-Trench transform

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