Warm-Up January 22 Write What You Know! Write everything you know about the prompt below for five minutes, try for at least 3-4 complete sentences. Explain the three major types of evidence that support the idea of sea-floor spreading.

Plate Tectonics Notes (Chapter 1.5)

Plate Tectonics Lithosphere: Theory of Plate Tectonics: The crust and upper mantle Rigid, broken into plates (continental plates, tectonic plates) Theory of Plate Tectonics: The plates of Earth’s lithosphere are in slow, constant motion, driven by convection currents in the mantle Incorporates the Theory of Continental Drift As plates move: colliding, moving apart, moving past each other, changes such as mountains, volcanoes, and deep-ocean trenches occur

Plate Tectonics Plate boundary: Fault: Where the tectonics plates meet each other, these breaks in the Earth extend throughout the lithosphere Fault: Smaller breaks in the lithosphere, often form along plate boundaries Associated with earthquakes

Types of Boundaries Divergent Boundary: The place where two plates diverge, or move apart Along ocean-ocean boundary, mid-ocean ridge occurs Along continent-continent boundary, rift valley occurs

Rift Valley

Types of Boundaries Convergent Boundary: Where two plates converge, or come together continent-continent boundary forms mountains continent-ocean boundary forms mountains, volcanoes, and a deep-ocean trench

Indian Subcontinent

Types of Boundaries Transform Boundary: Where two plates slide past each other in opposite directions Earthquakes most frequent along transform boundaries