Plate Tectonics

Mr. SkirbstEarth Science

Topic 26

Plate Tectonics

(lithospheric) plates

Plate Tectonics

(lithospheric) plates(rock) slabs

Plate Tectonics

(lithospheric) plates(rock) slabstectonics

Plate Tectonics

(lithospheric) plates(rock) slabstectonics

movement

Plate Tectonics

movement of rocky slabsacross the Earth

Plate Tectonics

theory of continental drift

Alfred Wegener

Plate Tectonics

Earth’s continents are “floating” from one place to another

Plate Tectonics

Evidence from fossils

Glossopteris(found in S. Hemisphere)

Plate Tectonics

Evidence from rocks

mountains, shapes, deposits

Plate Tectonics

Evidence from sea-floor

sea-floor spreadingmid-ocean ridge

Plate Tectonics

Plate BoundariesDivergent boundary

Plate BoundariesDivergent boundary

plates move apart

Plate BoundariesDivergent boundary

plates move apartfound along mid-ocean ridges

Plate BoundariesDivergent boundary

plates move apartfound along mid-ocean ridgescalled constructive boundary

Plate BoundariesDivergent boundary

Plate BoundariesConvergent boundary

Plate BoundariesConvergent boundary

plates come together

Plate BoundariesConvergent boundary

plates come togetherfound near trenches

Plate BoundariesConvergent boundary

plates come togetherfound near trenchescalled destructive boundaries

Plate BoundariesStrike-slip boundary

Plate BoundariesStrike-slip boundary

grind horizontally

Plate BoundariesStrike-slip boundary

grind horizontallyforms lateral faults

Plate BoundariesStrike-slip boundary

grind horizontallyforms lateral faultscalled a conservative boundary

Pangaea

PangaeaLarge, single landmass that

existed in the past before slowly breaking apart and moving into the current position