chapter 25 .3 and .4

Question 1

What is the boundary that marks a density change between layers?

Answer 1

Discontinuity

Question 2

How are discontiunitys identifyed

Answer 2

Sisemic waved

Question 3

What is a shadow zone?

Answer 3

Area where no sisemic waves have been recorded.

Question 4

What is another term for a shadow zone?

Answer 4

Dead zone.

Question 5

What are the degrees that shadow zones fall between?

Answer 5

105-140 degrees.

Question 6

Is the outer core a solid or a liquid?

Answer 6

Liquid

Question 7

Is the inner core a solid or a liquid, and why?

Answer 7

A solid because of pressure.

Question 8

What makes up the lithosphere?

Answer 8

The crust and the uppermost mantle.

Question 9

What is the asthenophere?

Answer 9

A plastic like layer which earths plates move on

Question 10

What elements make up the mantle?

Answer 10

Calcium, Aluminum, Iron, and Magnesium.

Question 11

What elements make up the core?

Answer 11

Iron and nickel.

Question 12

the measure of a fluids resistance to flow.

Answer 12

Viscosity

Question 13

the chemical compound silicon dioxide, SiO, which is a common ingredent in most magma

Answer 13

Silica

Question 14

Small volcanos that have short eruption cycles

Answer 14

Cinder cone volcanoes

Question 15

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

Answer 15

shield volcanoes

Question 16

a 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 the definition of a rock?

Question 18

How are rocks identified?