Lithosphere
Published on Nov 26, 2015
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PRESENTATION OUTLINE
TECTONIC PLATES
- Earths crust is split into pieces called tectonic plates
- The movement of these plates causes different formations on Earth
- Convergent divergent and transform boundaries are all types of plate movements
- the results of these movements and a process called subduction forms earthquakes, volcanos, ocean ridges, and mountains
- convergent boundaries collide, divergent boundaries pull apart and transform boundaries slide past eachother
Continental Drift
- The theory that the continents are moving
- Caused by the plate tectonics
- Pangea was a giant landmass 240 years ago
- Collision occurs when two plates have low density and collide to create mountains
- Continental rifting happens when a new plate forms when the lithosphere stretches to form a Rift Valley
Photo by e r j k p r u n c z y k
Sea Floor Spreading
- A theory created by Harry Hess
- the process in which the ocean floor expands when two tectonic plates split
Photo by wockerjabby
Mid-Ocean Ridge
- long underwater system of ridges that are seismically active
- 2 processes: ridge pull & slab push
- seeps magma onto the sea floor
- like a conveyor belt to bring new "sea floor" that cools down and spreads further
