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2/21/17 TYPES OF PLATE BOUNDARIES Objective: I will identify the three types of plate boundaries and explain the geologic processes that happen at each. PAGE 61 “Big Idea” for this Unit HOW DO MAJOR GEOLOGIC FEATURES FORM? Plate Boundary • where two tectonic plates border one another • there are 3 types of plate boundaries Divergent Boundary • mantle magma is rising, plates move apart Divergent Boundary • can separate land masses, forming seas and oceans Divergent Boundary • Key features: mid-ocean ridge, rift valley, spreading center volcanoes • Ex: Mid-Atlantic Ridge, Red Sea Convergent Boundary • magma is sinking, plates come together • subduction- one plate sinks under another due to differences in density Continental-Continental (no subduction) • Key features: large folded mountains • Ex: Himalaya Mountains Oceanic-Continental (subduction) • Key features: trench, volcanic mountain chain • Ex: Andes Mountains Oceanic-Oceanic (subduction) • Key features: deep-ocean trench, volcanic island arc • Ex: Japan Transform Boundary • does not produce magma, plates slide past each other Transform Boundary • Key features: earthquakes (plates do not slide smoothly), fault lines • Ex: San Andres Fault Output Activity (Page 60) • Complete your “Plate Boundary Chart” in detail • Use your Plate Tectonic Model, class notes, and textbook pages 249-251. • When finished, glue/tape onto page 60. • Extra credit stamps will be given tomorrow if completed in full, with color and a title.