chapter 5 test 1

Question 1

viscosity

Answer 1

measure of minerals resistance to flow

the more viscous the more violent because pressure builds up

Question 2

higher silica

Answer 2

higher viscosity

felsic

Question 3

lower silica

Answer 3

lower viscosity

mafic

Question 4

pahoehoe lava

Answer 4

resembles twisted ropey texture like toothepaste

Question 5

Aa Lava

Answer 5

rough, jagged blocky texture

Question 6

Lava Tube

Answer 6

top surface hardens but still flowing underneath until eventually clears out

Question 7

pillow lava

Answer 7

forms in ocean on ocean floor only big blobs like pillows

Question 8

pyroclastic mateials

Answer 8

ash and dust
pumice
cinders
volcanic bombs

Question 9

shield volcano

Answer 9

broad, slightly dome shaped
composed primarily of baslatic lavas
generally cover large areasproduced by mid eruptions of lava

Question 10

cinder cone

Answer 10

build from ejected lava, slope angle
rather small
frequently occur in groups

Question 11

composite volcano

stratovolcano

Answer 11

mostly in pacific ocean
large classic volcano shape
composed of interbreed lava flows and layers of pyroclastic debris

Question 12

lahar

Answer 12

volcanic mudflow

Question 13

crater

Answer 13

less than 1 kilometer

Question 14

caldera

Answer 14

greater than 1 kilometer

Question 15

Lava domes

Answer 15

bulbous masses of congealed lava

most are associated with explosive eruptions of gas rich magma

Question 16

volcanic pipes

Answer 16

what brings magma up from deep underground

sometimes brings diamonds

Question 17

volcanic necks

Answer 17

erupts and whatever magma didn’t’ leave hardens into a volcanic neck