Chapter 25.3 25.4

Question 1

what is the boundary that marks density change between layers?

Answer 1

discontinuity

Question 2

how are discontinuities identified?

Answer 2

by using seismic waves

Question 3

what are shadow zones?

Answer 3

areas where seismic waves arent recorded

Question 4

whats another name for shadow zones?

Answer 4

deadzone

Question 5

what degrees do shadow zones fall?

Answer 5

105-140 degrees

Question 6

is the outter core a liquide or a solid?

Answer 6

liquide

Question 7

is the inner core a liquide or solid?why

Answer 7

a solid because the pressure

Question 8

what makes up the listhosphere?

Answer 8

the crust and uppermost mantle

Question 9

which elements make up the mantle?

Answer 9

calcium aluminum iron and magnesium

Question 10

which elemnts makeup the core?

Answer 10

iron and nicle

Question 11

what is multon a liquide rock stored inside earth called.

Answer 11

magma

Question 12

where is the ring of fire located?

Answer 12

along pasific ocean shoreline

Question 13

which two specific places have volcanic activity due to diversions.

Answer 13

mid atlantic ridge and the east african rift valley.

Question 14

are hot spot startionary?

Answer 14

yes

Question 15

what is a measurment of a fluids resistance to flow?

Answer 15

viscosity

Question 16

if the viscocity is high will the fluid flow more quickly or slower?

Answer 16

more slowly

Question 17

what is the chemical compound that is common ingrediant in magma

Answer 17

silica

Question 18

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

Answer 18

more

Question 19

what is pyroclastic material?

Answer 19

any solid material that erupts from volcano

Question 20

what is the smallest type of pyroclastic material?

Answer 20

ash

Question 21

what is the largest type of pyroclastic material?

Answer 21

volcanic blocks and bombs

Question 22

what variety of gases cause a volcano to erupt?

Answer 22

water vapor,carbon dioxide,and sulfer dioxide.

Question 23

what happends when sulfer dioxide mixes with water?

Answer 23

it reduces the amount of solar radiation reaching earth.

Question 24

eruptive style is strongly linked to what?

Answer 24

temperature and composition.

Question 25

what are volcanos classified by?

Answer 25

size,shape,and materials that erupt.

Question 26

when do cinder cones volcanos erupt?

Answer 26

when tempatures are high,gas-rich,and basaltic lava.

Question 27

what valcano types are broad,flat structures composed of layer upon layer of lava flow?

Answer 27

sheild volcano