25.3 and 25.4

Question 1

what is the boundary that marks a density change

Answer 1

discontinuity

Question 2

how can discontinuity be identified

Answer 2

by using seismic waves

Question 3

what are the shadow zones

Answer 3

where no seismic waves have been recorded

Question 4

what is another name for a shadow zone

Answer 4

dead zone

Question 5

what are the degrees that shadow zone fall

Answer 5

between 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 liquid? why?

Answer 7

solid, due to the preasure

Question 8

what is a lithosphere

Answer 8

the crust and uppermost mantle

Question 9

what is the asthenosphere

Answer 9

a weaker plastic-like layer upon which earths lithospheric plates move

Question 10

what matalic materials make up the core

Answer 10

iron and nickel

Question 11

what elements make up the mantle

Answer 11

calcium, aluminum, iron, and magnesium

Question 12

boundary between two layers of material that have different densities

Answer 12

discontinuity

Question 13

areas on earths surface where no seismic waves are recorded

Answer 13

shadow zone

Question 14

the crust and uppermost mantle combine

Answer 14

lithosphere

Question 15

tectonic plates move on top of a plastic-like layer of the upper mantle

Answer 15

asthenosphere

Question 16

measure of a fluids resistance to flow

Answer 16

viscosity

Question 17

chemical compound silicon SiO2 which is a common ingredient in most magma

Answer 17

silica

Question 18

tend to be small, have heights in the hundreds of meter range, and have short eruption cycles

Answer 18

cinder cone volcano

Question 19

are broad, flat structures composed of layer upon layer of lava flow

Answer 19

shield volcano

Question 20

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 20

composite volcano

Question 21

what is molten or liquid rocks stored inside Earth?

Answer 21

magma

Question 22

where is the ring of fire located

Answer 22

in the pacific ocean

Question 23

what forms do tectonic plates create when they collide?

Answer 23

volcanoes

Question 24

which two specific locations can volcanic activity occur due to divergent

Answer 24

mid-Atlantic ridge

East African Rift Valley

Question 25

are hot spots stationary?

Answer 25

yes

Question 26

what are created from hot spots

Answer 26

volcanic islands( Hawaii )

Question 27

if a liquid has a higher viscosity is it going to run faster or slower

Answer 27

slower

Question 28

if a magma has a higher viscosity does it have more or less silica

Answer 28

more silica

Question 29

what is Pyroclastic material

Answer 29

any solid material that erupts from a volcano

Question 30

what is the smallest type of pyroclastic materials

Answer 30

volcanic ash

Question 31

what are the biggest type of pyroclastic materials

Answer 31

volcanic blocks and bombs

Question 32

what are the types of gas that come from a volcano

Answer 32

water vapor, carbon dioxide, and sulfur dioxide

Question 33

how are volcanoes classified

Answer 33

by size, shape, and the materials that erupt

Question 34

what are the 3 types of volcanoes

Answer 34

cinder volcanoes, composite volcano, shield volcano