Review Quiz 10/7

P waves are also called

• pushing waves

• pulling waves

• primary waves

• primordial waves

P and S waves help us to understand (check the 2 that are correct)

• The properties of the layers of the Earth

• which layers of the Earth are solid or liquid

• How the tides work in oceans

S waves (check the 3 that are correct))

• are longitudinal

• can't travel through liquids

• travel at 60% the speed of P waves

• arrive after the P waves.

What is the crust and upper area of the mantle called?

• focus

• tsunami

• epicenter

• lithosphere

What is the point on Earth's surface directly above the focus?

• tsunami

• seismic wave

• epicenter

• focus

Idea that the earth's crust is made up of moving plates is...

• lithosphere

• seismologist

• theory of plate tectonics

• tsunami

T or F: Scientists believe that Earth is made up of plates that float on the partly melted rock of Earth's mantle

T or F: A seismograph is used to detect, time, and measure the movements of the earth.

The movement of the tectonic plates is caused by

• the rotation of the Earth.

• convection currents in the Asthenosphere

• the gravity of the iron-nickel core.

• the Moho discontinuity.

In some areas of the world, like California and Japan, earthquakes are a common occurrence. How can this best be explained?

• The strong ocean currents are undermining both areas causing earthquakes.

• Both areas are located near the edge of the Pacific Ocean, the unstable sand causes earthquakes.

• Both areas are subjected to strong ocean wind and waves that causes earthquakes.

• Both areas are on the boundary of active plates, the motion of the plates causes earthquakes.