Study Guide for Plate Tectonics
Learn voacb for Mrs. George's seventh grade science class!!
Terms
undefined, object
copy deck
- Appalachians
- Stretch from eastern USA to the Gulf of Mexico; created when N. America collided with Africa.
- Theory of Plate Tectonics
- States that Earth's lithosphere (crust) broke up into moving plates.
- Himalayas
- Along the borders of Tibet and India; formed when India collided with Asia.
- Theory of Seafloor Spreading
- Mid-ocean ridge is a crack in the Earth's crust through which molton rock rises to the surface, adding new material to the ocean floor.
- Relationship between Rift Valleys and the MOR.
- Rift valleys and Mid-Ocean Ridges are both places where new materials/ocean floor is being created.
- Mantle
- layer surrounding the core
- Ocean floor
- basalt; 6km thick; more dense than crust
- Transform Fault
- Two divergent plate boundaries are sliding past eachother
- Subduction
- A place where 2 plates collide and 1 plate is pushed below the other one. Happens in a subduction zone.
- Asthenosphere
- upper solid portion that moves like liquid
- Pangaea
- "All Land"; a large, single, land mass made up of all the continents.
- How long ago did Pangaea exist?
- 300 Million years ago.
- Inner Core
- 1500km radius; solid mixture of iron, nickel and cobalt
- Core
- innermost layer of Earth
- Continents
- granite; 20-70km thick; less dense than the crust
- 7 Major Plates
- Indian-Australian, Philippine, Juan de Fuca, Cocos, Pacific, Nazca, Antarctic, South American, Caribbean, North American, Eurasian, Arabian, African
- Lithosphere
- made up of the crust and rigid upper mantle
- Convergent Boundaries
- Place where plates (continental, oceanic) are moving together forming trenches, island arcs, and folded mountains
- Moho
- Boundary between mantle and crust
- Divergent Boundaries
- Sites where two plates are moving apart
- Outer Core
- 2000km thick; liquid iron
- Asthenosphere
- Upper, solid portion that moves like liquid
- Crust
- Outermost layer of the earth, low density
- Continental Drift Theory
- Theory that states that the continents were once together; broke appart and moved to their present day locations.
- What is the evidence for the Continental Drift?
- Jigsaw fit between South America and Africa, Rock and mountain types on both coasts match, Climate clues, Similar fossils on both coasts.