6th Grade Ch 9

The vibrations in the ground that result from movement along breaks in Earth's lithosphere

• Faults

• Tsunamis

• Earthquakes

Where do most earthquakes occur?

• plate boundaries

• middle of plates

• middle of continents

A break in Earth's lithosphere where one block of rock moves toward, away from, or past another.

• fault

• earthquake

• plate boundary

Match the following fault types with their descriptions.

• Strike-Slip

• Forces push two blocks together. Rock above the fault moves up.

• Normal

• Two blocks of rock slide horizontally past in opposite directions.

• Reverse

• Forces pull two blocks of rock apart. Rock above the fault moves down.

Energy that travels as vibrations on and in Earth.

• Earth waves

• Earth vibes

• Seismic waves

Where rocks first move along the fault inside the earth.

• focus

• epicenter

• origin

Location of Earth's surface above the starting location of the earthquake.

• focus

• epicenter

• origin

Where is the epicenter relative to the focus?

• directly above

• directly below

• diagonal along fault

Wave that causes particles in the ground to move in a push-pull motion like a coiled spring.

• primary waves

• secondary waves

• surface waves

Particles move up and down at right angles relative to the direction the wave travels.

• primary waves

• secondary waves

• surface waves