Continental Drift

The continents were first together but now are apart .

The continents are moving.

Fossil Evidence

Animals die and leave their bones.

Nicholas Steno's anatomical drawing of an extant shark (left) and a fossil shark tooth (right). Steno made the leap and declared that the fossil teeth indeed came from the mouths of once-living sharks.

Rock Evidence

The Supporting Evidence Of Plate Tectonic Theory

llustration showing similar rock assemblages across

mountain belts are all the same rock type/formation

Plate Tectonics

A theory stating that the earth's surface is broken into plates that move.

The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.

Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge

Seafloor Spreading

The process that creates new sea floor as plates move away from each other at the mid-ocean ridges.

side way flow of hot materials near ocean ridges.

Earthquakes and Volcano Mapping

A global map of recorded earthquake locations for a period of time shows more clearly than any other feature the outline of the plates.

What two natural disasters does Chile have.

Hot Spots

areas of volcanic activities that result from plumes of hot solid material that have risen from deep inside earths mantle.

Places on the Earth's surface that are directly above a column of rising magma.