PLATE TECTONICS AND MOVEMENTS

PLATE TECTONICS

• a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates that move slowly over the underlying mantle

CONVECTION CURRENTS

SLAB PULL

RIDGE PULL

• Ridge push or sliding plate force is a proposed mechanism for plate motion in plate tectonics.

DIVERGENT PLATE BOUNDRY

• a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.

DIVERGENT PLATES

• On land, these plate movements make rift valleys.
• And example of this would be the East African rift.

DIVERGENT PLATES

• In the ocean, the plate movements make mid ocean ridge's.

CONVERGENT PLATE BOUNDARY

• A convergent boundary, also known as a destructive plate boundary (because of subduction), is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.

CONVERGENT PLATE BOUNDARY

• These plate movements on land with ocean crust it makes volcanic arcs.
• An example of this would be mt.st. Helens.

CONVERGENT PLATES

• These plate movements in water they. make volcanic island arcs.
• An example of this would be Hawaii

CONVERGENT PLATES

• When two land crusts converge it makes mountain ranges such as the Himalayas.

SUBDUCTION ZONE

• In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge.

DEEP OCEAN TRENCH

• Oceanic crust is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at trenches. The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor.
• An example of this would be the Puerto Rico trench.

TRANSFORM PLATE BOUNDARY

• A transform boundary, also known as conservative plate boundary since these faults neither create nor destroy lithosphere, is a type of fault whose relative motion is predominantly horizontal in either sinistral or dextral direction.

TRANSFORM PLATES

• When plates move along a transform boundary, earthquakes occur.

TRANSFORM PLATES

• An example of this plate boundary would be the San Andreas fault in California.