Earth Science (Mechanism of Plate Movements)

driving force and resisting forces

How huge crustal plates could possibly move are influence by this 2 forces

Collisional resistance

Occurs where a heavy plate is pulled into the mantle but resists subduction because of friction

slab resistance collisional resistance transform fault resistance drag force

Resistance Force include the following: 4

transform fault resistance

Spreading center along a ridge is broken by several kilometers. The plates encounter frictional resistance in the contact zone

Driving Forces

(Blank) either push tectonic plates toward each other or pull them apart

Mantle convection

(Blank) happens when heat in the core rises towards the mantle, increasing its kinetic energy and causing it to expand and spread out beneath the plates. Convection currents drive the plates away from each other and Heat energy dissipates in circular motion because of difference in temperature between the mantle and layer above it

Ridge push

(Blank) happens when lithosphere is pushed up by the asthenosphere because of convection currents from the mantle. Gravity pushes the plate down the ridge and a new crust is formed

Slab suction

(Blank) occurs between two colliding plates, one of which is subducting underneath the other plate, whereby convection currents in the upper mantle suck both plates down

Slab pull

(Blank) takes place when a subducting slab sinks into the hot mantle because of a difference in temperature The rest of the plate to which the slab is attached to is being pulled in as well

Resisting Force

(blank) act against the driving forces of plate tectonics

Drag Force

(blank) resists movement of the lithospheric plates

Mantle convection Slab pull Slab suction Ridge push

4 types of Driving Forces

Continental Drift Theory

A theory that proposes that the plates of the Earth's crust continually move and the speed that they do is infinitesimal

infinitesimal

The speed on which the Earth move is (blank)

Collisional resistance

This force opposes the slab pull

Slab resistance

When plates collide at a plate boundary in a subduction zone, the force will resist movement