Warm UP 12 / 03/ 12 Give the three sources of evidence to support the theory of Continental Drift

Tectonic Plates have boundaries 3 Types of Boundaries 1.Divergent boundaries 2.Convergent boundaries 3.Transform boundaries

DIVERGENT BOUNDARIES  Occurs where plates move apart  Most of these boundaries are found in the oceans

CONVERGENT BOUNDARIES  Occurs where plates push together  Can be Oceanic to Oceanic, Oceanic to Continental, and Continental to Continental

CONTINENTAL – CONTENENTAL COLLISION Occurs where two plates carrying continental crust push together. Both crusts are the same density. This collision forms Mountain Ranges

Oceanic-Oceanic Subduction Subduction – when one plate sinks beneath another This occus where one plate with oceanic crust sinks, under another plate with oceanic crust Forms deep ocean trenches and island arcs

Oceanic – Continental Subduction Occurs when ocean crust sinks under continental crust Forms deep-ocean trenches and coastal mountains

TRANSFORM BOUNDARIES Occurs where plates scrape past each other Occurs mostly on the sea floors near mid-ocean ridges Example of one on land is the San Andreas Fault in California