PLATE TECTONICS LAB DISCUSSION Fruit Rollup and Graham Cracker DIVERGENT BOUNDARIES Mid-Ocean Ridges two oceanic plates pull apart. The result is a mid-ocean ridge, such at the Mid-Atlantic Ridge. DIVERGENT BOUNDARIES Rift Valleys two continental plates pull apart. The result is
a rift valley, such at the Great Rift Valley in Africa. SUBDUCTION Definition: One tectonic plate moves under another tectonic plate, thus sinking into the mantle, as the plates converge. CONVERGENT OCEANIC/OCEANIC
When an oceanic plate pushes into and subducts under another oceanic plate, the overriding plate is lifted up and an island arc can be created Example: Aleutian Islands of Alaska
ALEUTIAN ISLANDS Islands created by oceanic to oceanic convergent plates CONVERGENT OCEANIC/CONTINENTAL When an oceanic plate pushes into and subducts under a
continental plate, the overriding plate is lifted up and a volcanic mountain range can be created Example: Andes Mountains In South America ANDES MOUNTAINS Volcanic
Mountains created by convergence of oceanic to continental plates CONTINENTAL-CONTINENTAL CONVERGENCE
When two continents meet or collide head-on, neither plate is subducted because the continental rocks are relatively light Instead, the crust folds and buckles.
The collision of India into Asia 50 million years ago caused the mountains known as the Himalayans. HIMALAYA MOUNTAINS TRANSFORM BOUNDARIES Transform Boundaries are
where two plates are sliding horizontally past one another. When the two plates slide past each other, energy builds up and when released, the stress and pressure of this movement can cause an
earthquake. Example: The San Andreas Fault in California PLATE BOUNDARIES FOLLOW-UP QUESTIONS
Title your page Follow Up: Tectonics Lab and write down the questions and answers in your journal after Thursdays lab: 1. How do the movements of tectonic plates cause geological events? 2.
How are convergent plates different from divergent plates? 3. What are some features on Earth that are caused by plate movement? (list at least two) 4.
Explain, in your own words, what happens during the process of subduction.
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