Unit 5 Review

Originally the Continental Drift Theory was not well received by other scientists. Why?

• There was a competing theory at the time which was more believable with more evidence

• There was no numerical data

• The scientists did not know the force responsible for moving the continents

• The scientists did not fully understand how fossils could be found so far apart

Tags

NGSS.MS-ESS2-3

NGSS.MS-LS4-1

What theory stated that Earth's plates are in slow, constant motion but culd not explain how they moved?

• Theory of Plate Tectonics

• Theory of Continental Drift

• Theory of Sea-Floor Spreading

• Theory of Convergence

Tags

NGSS.MS-ESS2-3

What was the new evidence that explained why continents drifted or moved from their original single landmass?

• Fossil found in Antarctica indicated continent was once near equator

• Landforms found on different continents were composed or made of the same types of rocks

• Convection currents in the asthenosphere of the mantle were responsible for plate movement.

• Sea-floor spreading indicated ocean currents pushed the plates

Tags

NGSS.MS-ESS2-3

The process by which the more dense plate sinks beneath another plate returning crust to the mantle

• subduction

• sea-floor spreading

• slab pull

• ridge push

Tags

NGSS.MS-ESS2-3

The process that adds more crust to the ocean floor

• subduction

• sea-floor spreading

• ridge push

• slab pull

The place where ocean floor or oceanic crust sinks back into the mantle

• subduction zone

• trench

• mid-ocean ridge

• asthenosphere

Feature formed at an oceanic-oceanic divergent boundary

• folded moutain

• mid-ocean ridge

• fault

• trench

Feature that forms where two continental plates equal density collide. (continental-continental)

• Mid-ocean ridge

• folded mountain

• subduction zone

• trench

Two features that may form at an oceanic to continental plate subduction zone.

• trench, volcano

• trench, folded mountain

• trench, mid-oceanic ridge

• trench, fault

Tags

NGSS.MS-ESS2-2

At what boundary does sea-floor spreading occur?

• oceanic-oceanic

• oceanic-continental

• continental-continental