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The Effects of Plate Boundaries. There are 3 Types of Plate Boundaries. Divergent Convergent: Ocean-Ocean Ocean-Continent Continent-Continent Transform. Divergent Plate Boundaries. Divergent plates cause SEA FLOOR SPREADING.
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There are 3 Types of Plate Boundaries • Divergent • Convergent: • Ocean-Ocean • Ocean-Continent • Continent-Continent • Transform
Divergent Plate Boundaries • Divergent plates cause SEA FLOOR SPREADING. • Over geologic time, divergent faults cause continents to move away from one another. • Start off as Rift Valleys, eventually become Mid-Ocean Rifts
Convergent Boundaries • Convergent boundaries occur when two plates collide. • The lighter plate always goes over the heavier plate. • The heavier plate is SUBDUCTED • Create VOLCANOES (on land and in sea), and MOUNTAIN RANGES. • THERE ARE 3 TYPES OF CONVERGENT PLATES BOUNDARIES
Ocean-Continent Plate Boundaries • Occur when an oceanic and continental plate meet. • The ocean plate is heavier and slides under the continent. • Often results in volcanoes on land and mountain ranges
Continent-Continent Plate Boundaries • Occur when continental plates meet. • Both are heavy and neither can be pushed down into the Earth. • Can either smush together, or one can go on top of the other, resulting in very tall mountains. • Eventually, they come to a stop. Himalayan Mtns.
Ocean-Ocean Plate Boundaries • Occur when two oceanic plates meet. They are both heavy, and one sea floor slides over another. • A trench is formed, and often chains of islands result.
Hot Spots vs. Convergent Boundaries • Both hot spots and ocean-ocean convergent boundaries can create chains of islands. • However, convergent boundaries create islands when one plate is subducted another. • Hot spots are bubbles of magma that create islands as a plate moves above it.
Transform Plate Boundaries • Occur when two plates slide past each other. • Create Strike-slip faults, can create hills, but not mountains. • San Andreas Fault