Ch2

Question 1

Seismic Waves

Answer 1

When earthquakes occur, energy is released that travels through Earth in the form of vibrations, or Seismic waves

Question 2

2 kinds of waves

Answer 2

Surface waves and body waves

Question 3

Surface Waves

Answer 3

They move over Earth’s surface a little like ocean waves, but travel much faster. These do the most property damage

Question 4

Body Waves

Answer 4

Cause less damage but are more useful in studying Earth’s interior bc they travel beneath the surface

Question 5

Refract

Answer 5

As body waves travel from one type of material into another, their speed can change and they will change direction, or refract.

Question 6

2 kinds of body waves

Answer 6

primary-waves and secondary-waves

Question 7

Primary waves (travel through solid, liquid, gas)

Answer 7

p-waves travel faster than any other kind of seismic wave & are the first to arrive to a location.

Question 8

Compressional Waves

Answer 8

P-waves are also known as compressional waves bc they cause the material they pass through to compress and stretch parallel to the direction the waves travel.

Question 9

Secondary Waves (travel through solids)

Answer 9

s-waves travel slower than s-waves but faster than surface waves. 2nd to arrive to location

Question 10

Shear Waves

Answer 10

s-waves are also known as shear waves bc they cause the material they pass through to shake from side-to-side, perpendicular to direction they travel.

Question 11

Body waves cont.

Answer 11

Travel downward from the location of earthquake, reach some max depth, then return to surface.

Question 12

Earth’s interior

Answer 12

3 layers: curst, mantle, core.

Question 13

Crust

Answer 13

Thin, rocky layer that comprises about 0.4% of Earth’s mass and less than 1% of its volume.

Question 14

2 kinds of crust

Answer 14

Continental crust & Oceanic crust

Question 15

2 kinds of crust

Answer 15

Continental crust & Oceanic crust