Earth Science Unit 6 Plate Tectonics

A cause of plate motion caused by the formation of new crust at divergent plate boundaries.

A part of the crust that is thinner, but composed of heavier minerals and is more dense.

The point within the earth where the earthquake starts

Evidence for Continental Drift found in the matching the shore lines of the continents.

A plate boundary where new crust is being created

The scientist that proposed Plate Tectonics

Waves that travel along the surface of the earth, they are the slowest but most damaging waves

The point on the earth's surface above the point where the earthquake starts

Evidence for Continental Drift based on traces of very cold climate in today's warm regions.

Long curved valleys found along the edges of continents on the ocean floor.

A feature that is formed at a convergent boundary between oceanic and continental plates.

A layer of the earth that includes the crust and part of the upper mantle.

The scientist that proposed Continental Drift

A plate boundary where Earthquakes occur

A cause of plate motion related to gravity acting on the plates at subduction zones.

The central part of the interior, made molten and solid nickel and iron.

The thin rocky outer layer of the earth

A cause of plate motion related to the motion of heated material in the mantle

A plate boundary also known as a spreading center.

When the friction that is resisting the plate motion is overcome the earthquake starts.

Small quakes that precede or follow a major quake that concentrate or release energy.

The tool that scientists use to study earthquakes

Evidence of Sea Floor Spreading base on old rocks near continents and young rocks near ridges

The thickest part of the interior, made of rocks that are plastic because of heat and pressure

A plate boundary were the two plates are sliding past one another

A feature that is formed at a convergent boundary between two oceanic plates.

A system of mountains found in the oceans that extends for 70000 km

A part of the crust that is thicker, but composed of lighter minerals and is less dense.

The way the energy from the earthquake moves away from the point of origin.

A plate boundary also known a strike/slip fault

A vibration of the lithosphere caused by the release of energy at plate boundaries.

A cause of hot spots that may not move as the plates do.

Before an earthquake the movement of the plates stores energy by 

Waves that can travel through the interior of the earth

The scientist that proposed Seafloor Spreading

Waves that travel the fastest as longitudinal waves they cause the least damage.

Evidence for Continental Drift based on remains of plants and animals in separated continents.

Once the friction is released the rocks snap back into their relaxed shape

Evidence for Continental Drift based on mountain ranges the same age on separated continents.

Evidence of Sea Floor Spreading base on seismograph data

A plate boundary where crust is not created or destroyed

A plate boundary were old crust is being destroyed.

The name of the super continent that existed 200 million years ago

Evidence of Sea Floor Spreading from changes in the magnetic field of the earth over time.

A feature that is formed at a convergent boundary between two continental plates.

A part of the upper mantel that is very flexible, is allows the plates of crust to side around.

Waves that travel transverse waves they cause the some damage and middle speed.

A plate boundary were the two plates are separating

A plate boundary were the two plates are colliding

A feature that is formed at a divergent boundary between two oceanic plates.