6th grade review April 30th PLATE TECTONICS DRIFTING CONTINENTS

WEGENER’S IDEA THAT THE CONTINENTS SLOWLY MOVED OVER EARTH’S SURFACE

CONTINENTAL DRIFT

ACCORDING TO WEGENER, THE CONTINENTS WERE JOINED TOGETHER IN A SUPERCONTINENT.

PANGAEA

A TRACE OF AN ANCIENT ORGANISM THAT HAS BEEN PRESERVED IN ROCK

FOSSIL

SEA-FLOOR SPREADING

LONG CHAINS OF MOUNTAINS THAT RISE FROM THE OCEAN FLOOR

MID-OCEAN RIDGE

OLDER STRIPS OF ROCK MOVE OUTWARD FROM EITHER SIDE OF THE RIDGE.

SEA-FLOOR SPREADING

PART OF THE OCEAN FLOOR SINKS BACK ONTO THE MANTLE AT DEEP OCEAN TRENCHES

DEEP OCEAN TRENCHES

THE PROCESS BY WHICH THE OCEAN FLOOR SINKS BENEATH A DEEP OCEAN TRANCH AND BACK INTO THE MANTLE

SUBDUCTION

THE THEORY OF PLATE TECTONICS

PLATE DIVERGENT BOUNDARY CONVERGENT BOUNDARY TRANSFORM BOUNDARY PLATE TECTONICS FAULT RIFT VALLEY

Plate tectonics is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the Earth's lithosphere, since tectonic processes began on Earth between 3 and ...

In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.

In plate tectonics, a convergent boundary, also known as a destructive plate boundary, is a region of active deformation where two or more tectonic plates or fragments of the lithosphere are near the end of their life cycle.

Transform boundaries are places where plates slide sideways past each other. At transform boundaries lithosphere is neither created nor destroyed. Many transform boundaries are found on the sea floor, where they connect segments of diverging mid-ocean ridges. California's San Andreas fault is a transform boundary.

plate tectonics a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates that move slowly over the underlying mantle.

A fault is a crack in the Earth's crust A fault is a crack in the Earth's crust. Typically, faults are associated with, or form, the boundaries between Earth's tectonic plates. In an active fault, the pieces of the Earth's crust along a fault move over time. The moving rocks can cause earthquakes

A rift valley is a linear-shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault.