25.3 and 25.4

Question 1

what is the boundary that marks a density change

Answer 1

the discontinuity

Question 2

how can discontinuity be identified

Answer 2

seismic waves

Question 3

what are the shadow zones

Answer 3

were 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

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 a liquid?why?

Answer 7

solid due to the presure

Question 8

what is a lithosphere

Answer 8

the crust and the upper most mantle

Question 9

what is the asthenosphere

Answer 9

its a plastic like layer which the earths layers move on

Question 10

what metalic materials make up the core

Answer 10

iron and nickle

Question 11

what four elements make up the mantle

Answer 11

iron,aluminum,calcium,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

what happens when 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