Science Chapter 6 Test

Front 1

Volcano

Back 1

a weak spot in the crust where molten material or magma comes to the surface

Front 2

Magma

Back 2

a mixture of rock-forming substances, gases, and water from the mantle

Front 3

Lava

Back 3

magma when it reachs the surface

Front 4

Ring of Fire

Back 4

a major volcanice belt, formed by many volcanoes that rim the Pacific Ocean

Front 5

island arc

Back 5

are stings of islands that are formed when sea-floor spreading and subduction occurs

Front 6

hot spot

Back 6

is an area where material deep from within the mantle rises and melts, forming magma

Front 7

element

Back 7

is a substance thatcannot be broken down into other substances

Front 8

compound

Back 8

a substance made up of two or more elements that have been chemically combined

Front 9

pyhsical property

Back 9

is any characteristic of a substance that can be measured without changing the composition of the substance

Front 10

chemical property

Back 10

is any property that produces a change in the compositionof matter

Front 11

viscosity

Back 11

the pyhsical property of liqueds and the resistance of a liqued to flow

Front 12

silica

Back 12

a compound made up of particales of the elements oxygen and silicon

Front 13

pahoehoe

Back 13

fast moving, hot,lava that has a low viscosity

Front 14

aa

Back 14

lava that is cooler and flows slower and has a high viscosity

Front 15

magma chamber

Back 15

a place beneath the volcano where magma collects

Front 16

pipe

Back 16

a long tube in the ground that connects the magma chamber to Earth's surface which magma travel up through

Front 17

vent

Back 17

an opening in the volcano where molten rock and gas leave the volcano

Front 18

lava flow

Back 18

an area covered by lava as it pours out of a vent

Front 19

crater

Back 19

a bowl shaped area that may form at the top of the volcano around the central vent

Front 20

pyroclastic flow

Back 20

occurs when an explosive eruption hurls out a mixture ofhot gases, ash, cinders,and bombs

Front 21

dormant

Back 21

a sleeping volcano that may awaken and become active in the future

Front 22

extinct

Back 22

a volcano that is unlikly to erupt again

Front 23

sheild volcano

Back 23

thin layers of lava pour out of vents gradually building a wide, gently sloping mountain

Front 24

cinder cone

Back 24

ash,cinders,and bombs build up around the vent in a steep,cone shaped hill or small mountain

Front 25

composite volcano

Back 25

are tall, cone shaped mountains in which layers of lava alternate with layers of ash

Front 26

caldera

Back 26

the huge whole left by the collapse of a volcanic mountain

Front 27

volcanic neck

Back 27

forms when magma hardens in a volcano's pipe

Front 28

dike

Back 28

when magma forces its self across rock layers

Front 29

sill

Back 29

when magma squeezes between horizontal layers of rock

Front 30

batholith

Back 30

is a mass of rock formed when a large body of magma cools inside the curst

Front 31

geothermal activity

Back 31

magna a few kilometers beneath Earth's curst heats unground water

Front 32

geyser

Back 32

is a fountain of water and steam that erupts from the ground