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3 Types Of Plate Boundaries And What They Create 1. DIVERGENT: plates pull apart due to tension Types of Crust ← → Land Forms Created Where Is It on Earth Continental/Continental Rift valleys Red Sea Rift Oceanic/Oceanic Mid-oceanic ridges New sea floor Mid-Atlantic Ridge 2. CONVERGENT: plates crash or collide into each other due to compression. Sea floor is destroyed at subduction zones. →← SUBDUCTION ZONE SUBDUCTION ZONE Pictures at right a. oceanic converging into continental b. oceanic converging into oceanic c. continental converging into continental Convergent Plate Boundaries Continued…. Types of Crust Oceanic/Continental Oceanic/Oceanic Continental/Continental Land Forms Created Trenches Where Is It on Earth Mariana Trench Volcanic mountains on the coastline Mt. St. Helens and Mt. Rainier Trenches Peru-Chile Chain of volcanic islands Aleutian Islands Mountain Ranges Himalayas Is There Subduction? YES…Sea floor is destroyed YES…Sea floor is destroyed NO…crust is pushed up 3. TRANSFORM: plates slide past each other due to shearing. Crust is neither created nor destroyed. ↑↓ Types of Crust Continental/Continental Land Forms Created Strike-slip fault…. Earthquakes happen here Where Is It on Earth San Andreas Fault AMAZING EARTH SCIENCE FACTS 1. 2. 3. 4. 5. 6. 7. New ocean floor is created at mid-ocean ridges. Crust is youngest here at the ridges due to rising magma. At divergent boundaries, ridges are formed where magma comes up through the sea floor At convergent boundaries (Continental-Oceanic), the denser plate (oceanic) subducts beneath the continent plate. An oceanic plate will always sink under a continental plate because it is denser. When two continents collide mountains are made –example is Mt. Everest in the Himalayas Transform boundaries slide past each other. (Ex. San Andreas Fault) Volcanic activity is always associated with subduction.