chapter 25.3 and 25.4

Question 1

what is the boundary that marks a density change between layers

Answer 1

discontinuity

Question 2

how are discontinuities identified

Answer 2

by using seismic waves

Question 3

what is the shadow zone

Answer 3

an area where no seismic waves have been recorded

Question 4

what is another term for shadow zone

Answer 4

dead zone

Question 5

what are the degrees that shadow zones fall between

Answer 5

105 and 140

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? why?

Answer 7

solid, because of pressure

Question 8

what makes up the lithosphere

Answer 8

the crust and the upper mantle

Question 9

what is the asthenosphere

Answer 9

plastic like layer which earths layers move on

Question 10

which elements make up the mantle

Answer 10

calcium, aluminum, iron, and magnesium

Question 11

which elements make up the core

Answer 11

iron, nickel

Question 12

the measure of a fluids resistance to flow

Answer 12

viscosity

Question 13

the chemical compound silicon dioxide, SIO2, which is a common ingredient in most magma

Answer 13

Silica

Question 14

tend to be small, heights in the hundreds meters ran8ge 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 steep-sided, often thousands of meters high and tens of kilo meters across the base

Answer 16

composite volcanoes

Question 17

what is molten or liquid rock stored inside earth called?

Answer 17

magma

Question 18

where is the ring of fire located

Answer 18

pacific ocean

Question 19

what forms when tectonic plates collide along subduction zones

Answer 19

volcanoes

Question 20

which two specific locations have volcanic activity due to divergents

Answer 20

mid Atlantic ridge, east African rift valley

Question 21

are hotspots stationary? what are created from hots pots

Answer 21

Yes, islands

Question 22

if a viscosity is higher is it going to flow slower or fast?

Answer 22

slower

Question 23

if magma has a high viscosity is going to have more or less silica

Answer 23

more

Question 24

what is pyroclastic material

Answer 24

any solid material that erupts from a volcano

Question 25

what is the smallest type of pyroclastic material

Answer 25

ash

Question 26

what is the largest type pf pyroclastic material

Answer 26

volcanic blocks and bombs

Question 27

what types of gases come from volcanoes

Answer 27

water vapor, carbon dioxide, sulfur dioxide

Question 28

how are volcanoes classified

Answer 28

shape, size, and materials that erupt

Question 29

what are the three types of volcanoes

Answer 29

cinder cone, shield, and composite