chapter 25.3 25.4

Question 1

what is the boundary that marks density change between layers

Answer 1

discontinuities

Question 2

how can discontinuities be identified

Answer 2

by using seismic waves

Question 3

what is a shadow zone

Answer 3

is where no seismic waves have been recorded

Question 4

what is another name 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 and why?

Answer 7

solid because its the pressure

Question 8

what makes up the lithosphere

Answer 8

the crust and uppermost mantle

Question 9

what makes up the asthenosphere

Answer 9

plastic like layer which earth’s lithospheric plates move

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 and nickel

Question 12

the measure of a fluid’s 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, have heights in the hundreds of meters range, and have short eruptions cycle

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 kilo meters across the base,and composed of layers of both lava and ash

Answer 16

composite volcanoes

Question 17

what is molten or liquid rocks store inside earth called

Answer 17

Magma

Question 18

where is the ring of fire located

Answer 18

The Pacific Ocean

Question 19

what form when tectonic plates collide along subduction zones

Answer 19

volcanoes

Question 20

what are two specific locations have volcano activity due to divergent

Answer 20

east African rift valley and the Mid Atlantic rift valley

Question 21

are hot spots stationary

Answer 21

yes

Question 22

what are created with hot spots

Answer 22

islands(Hawaiian islands)

Question 23

if the viscosity is higher is it going to faster or slower

Answer 23

slower

Question 24

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

Answer 24

more

Question 25

what is pyroclastic material

Answer 25

solid material that erupts from a valcanoes

Question 26

what is the smallest type of pyroclastic material

Answer 26

ash

Question 27

what is the biggest pyroclastic material

Answer 27

blocks and bombs

Question 28

what the gases that come from volcanoes

Answer 28

water vapor and carbon dioxide and sulfur dioxide

Question 29

how are volcanoes classified

Answer 29

by shape,size and materials that erupt from it