11/21/2022 Homework #4: Earthquakes

What is an earthquake?

• A huge wave caused by underwater land movement

• The shaking of the earth’s crust caused by a release of energy.

• Downward slope movement of rock, soil, and other objects

• Pressure builds below the earth’s surface producing eruptions of lava, rock, and volcanic gases

What is a fault?

• The point at which the rock first breaks and moves in an earthquake

• The scale used to measure earthquakes

• The point on the earth’s surface directly above the focus

• A break in the plates along which movement has occurred

Which of the following is below the surface ?

• Epicenter

• Focus

Which of the following describes S waves?

• Compression waves that push and pull rock.

  Can travel through any material.

• Waves that move side to side.

  Can travel only through solids.

• Waves that travel along the surface of Earth. Cause the most damage of any earthquake wave.

Which of the following describes P waves?

• Compression waves that push and pull rock.

  Can travel through any material.

• Waves that move side to side.

  Can travel only through solids.

• Waves that travel along the surface of Earth. Cause the most damage of any earthquake wave.

Which of the following is the instrument used to measure earthquakes?

• Geiger counter

• Echocardiogram

• Seismograph

• X-Ray

What is the name of the scale used to measure the strength of an earthquake?

• Richter Scale

• Fujita Scale

• Saffir-Simpson Scale

You should drop,cover,hold on when you are in a earthquake

• True

• False

That's how an earthquake is created

• False

• True

When does an earthquake happen?

• when underground rock suddenly breaks and there is rapid motion along a fault

• When the earth rotates to fast

• when the oceans waves are very large