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 can discontinuities be identified

Answer 2

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

between 105 to 140

Question 6

is the outer core solid or liquid?

Answer 6

liquid

Question 7

is the inner core solid or liquid? why?

Answer 7

solid because there is so much pressure

Question 8

what makes up the lithosphere?

Answer 8

the crust and upper most 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

what elements make up the core

Answer 11

iron and nickle

Question 12

the measure of a fluids resistance to flow

Answer 12

viscosity

Question 13

chemical compound silicon dioxide

Answer 13

silica

Question 14

tend to be small have heights in hundreds of meters of range

Answer 14

cinder cone volcanoes

Question 15

are broad flat structures composed of layer upon layer

Answer 15

shield volcanoes

Question 16

are large and steep-sided often thousands of meters high and tens of kilometres

Answer 16

composite volcanoes

Question 17

what is molten or liquid rock stored inside earth

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 occurs do to divergents

Answer 19

east african rift valley

Question 20

are hotspots stationary

Answer 20

yes they are

Question 21

if magma has a high viscosity will it contain more or less silica

Answer 21

more

Question 22

what is pyro-clastic material

Question 23

what is the smallest type pryo clastic 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 gasses that erupt from a volcano

Answer 25

water vapor carbon dioxide and sulfur dioxide

Question 26

what are the three types of volcanoes

Answer 26

cinder cone, shield, composite