PRESENTATION OUTLINE
Plate tectonics
Is a scientific theory that describes the large-scale motion of Earth's lithosphere.
Cause of plate movement 1
convection currents in the
mantle
the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface.
Cause of plate movement 2
Ridge push
Ridge push or sliding plate force is a proposed mechanism for plate motion in plate tectonics.
Cause of plate movement 3
Slab pull
Slab pull is the portion of motion of a tectonic plate that can be accounted for by its subduction.
Divergent plate boundary
a linear feature that exists between two tectonic plates that are moving away from each other.
Convergent plate boundary
is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
Subduction zone
A subduction zone is the biggest smash-up on Earth, marking the collision between two of the planet's tectonic plates, the pieces of crust that slowly move across the surface over millions of years. When two tectonic plates meet, one may slide underneath the other, curving down into the mantle.
Deep ocean trench
any long, narrow, steep-sided depression in the ocean bottom in which occur the maximum oceanic depths, approximately 7,300 to more than 11,000 metres (24,000 to 36,000 feet).
Transform plate boundary
a strike-slip fault that offsets a mid-ocean ridge in opposing directions on either side of an axis of seafloor spreading.
