Chapter 25.3

Question 1

What is the boundary that marks a density change?

Answer 1

Discontinuity

Question 2

How are discontinuities identified?

Answer 2

By using/studying seismic waves.

Question 3

What are shadow zones?

Answer 3

Areas where no seismic waves are recorded.

Question 4

What is another name for shadow zones?

Answer 4

Dead Zone

Question 5

Between what degrees do shadow zones fall?

Answer 5

105-140 degrees

Question 6

Is the outer core a solid or a liquid?

Answer 6

Liquid

Question 7

Why is the outer core a liquid?

Answer 7

All the pressure.

Question 8

What makes up the lithosphere?

Answer 8

Crust and the uppermost mantle.

Question 9

What is the asthenosphere?

Answer 9

A plastic like-layer, which Earths plates move.

Question 10

What elements make up the mantle?

Answer 10

Calcium, Aluminum, Iron, and Magnesium

Question 11

Which elements make up the core?

Answer 11

Iron and Nickel

Question 12

Is the measure of a fluid resistance to flow.

Answer 12

Viscosity

Question 13

The chemical compound silica dioxide, sio2, which is a command ingredient in most magma.

Answer 13

Silica

Question 14

Tend to be small, have heights in the hundreds of meters range , and have short eruption cycles.

Answer 14

Cinder cone volcanoes

Question 15

Are broad, flat structures composed of layer upon layer of lava flows.

Answer 15

Shield volcanoes

Question 16

Are large and steep-sided, often thousands of meters high and tens of kilometers across the base, and composed of layers of both lava and ash.

Answer 16

Composite volcanoes

Question 17

What is molten or liquid, rocks stored inside Earth called?

Answer 17

Magma

Question 18

Where is the ring of fire located?

Answer 18

Pacific Ocean

Question 19

What are two specific locations where volcanic activity occur due to divergent valleys?

Answer 19

Mid-Atlantic Ocean ridge, or African Rift

Question 20

Are hot spots stationary?

Answer 20

Yes

Question 21

If magma has a high viscosity, will it contain more or less silica?

Answer 21

More

Question 22

What is pyroclastic material?

Answer 22

Any solid material that comes from a volcano

Question 23

What is the smallest pyroclastic material?

Answer 23

Volcanic ash

Question 24

What is the largest pyroclastic material?

Answer 24

Volcanic blocks and bombs

Question 25

What are the types of gases that erupt from a volcano?

Answer 25

Water vapor, carbon dioxide, and sulfur dioxide

Question 26

How are volcanoes classified?

Answer 26

Their size, shape, and material that erupt from them

Question 27

What are the three types of volcanoes?

Answer 27

Shield, cinder, and composite