2 1. GravityEarth’s gravitational force is always pulling objects toward the center of the earth, even the tectonic plates.This is most noticeable on an oceanic crust, where the ridge is “uphill” from the trench.
3 2. DensityThe more dense a plate is, the more likely it is to sink. Oceanic Plates are denser than Continental Plates. This is why oceanic plates are subducted underneath continental plates.
4 Convection CurrentsHot magma in the Earth moves toward the surface, cools, then sinks again.Creates convection currents beneath the plates that cause the plates to move.
35 Questions... What causes plates to move? How is a convection current formed?HOW ABOUT A LITTLE QUIZ?
36 Divergent boundary of two continental plates. Creates a __________. Example: _____________rift valleyEast African Rift
37 Convergent boundary of two oceanic plates. Creates an ________ and a _____. Example: _____island arctrenchJapan
38 Convergent boundary of an oceanic plate and a continental plate Convergent boundary of an oceanic plate and a continental plate. Forms a _______ mountain range and a ______. Examples: _______ MtsvolcanictrenchAndes
39 Convergent boundary of two continental plates Convergent boundary of two continental plates. Forms a ______ mountain range. Examples: ___________Himalayasfolded
40 Transform-fault boundary where the North American and Pacific plates are moving ____ each other. Example: ________________ in CaliforniapastSan Andreas Fault
41 Plate Boundaries Review Places where plates move apart are called _____________ boundaries.When continental plates diverge a ___________ is formed.When two oceanic plates converge what is created? _________________The Himalayas formed mainly from continental plate collisions and therefore are a __________ mountain range.The force moving the plates is ____________ .divergentrift valleyan island arc and a trenchfoldedConvection currents