volcanic terraine

Question 1

naturally occuring landform where lave extruded from a magma chamber underground

Answer 1

volcano

Question 2

zone of greatest seismic activity and consists of approximately 75% of the world’s volcano

Answer 2

pacific ring of fire (circum-pacific belt)

Question 3

oceanic-oceanic crust collision

Answer 3

volcanic island arc

Question 4

oceanic-continental crust collision

Answer 4

continental volcanic arc

Question 5

continental-continental crust collision

Answer 5

volcanic plateau

Question 6

formed by rising mantle plumes

Answer 6

hot spot

Question 7

consists less than 50% of silica and least viscous magma

Answer 7

mafic (basaltic) magma

Question 8

~60% silica content and intermediate viscosity magma

Answer 8

intermediate (andesitic) magma

Question 9

~70% silica content and the most viscous magma

Answer 9

felsic (rhyolitic) magma

Question 10

magma with rough jagged surface and sharp edges

Answer 10

AA

Question 11

exhibit smooth ropy surface

Answer 11

pahoehoe

Question 12

magma consists of blocks with slightly curved surface, smooth surface

Answer 12

block lava

Question 13

outpourings of lava in the ocean floor

Answer 13

pillow lava

Question 14

volcano with atleast 1 eruption in the last 10,000 years

Answer 14

active volcano

Question 15

active volcano that is not erupting, supposed to erupt again

Answer 15

inactive volcano

Question 16

volcano with no eruption for atleast 10,000 years, not expected to erupt again

Answer 16

dormant/extinct volcano

Question 17

fissure eruption, the most calmest eruption, release free flowing basaltic magma

Answer 17

icelandic

Question 18

characterised by effusive emission of highly fluid basalt lavas with low gas content, builds shield volcanoes

Answer 18

hawaiiin

Question 19

short explosive burst by booming sounds.

Answer 19

strombolian

Question 20

eruption with moderateley viscous magma, and so have thick, stubby flows

Answer 20

vulcanian

Question 21

the largest and most violent of all types of volcanic erruptions

Answer 21

plinian

Question 22

there is a single, usually small eruption. usually associated with fissure volcano belts

Answer 22

monogenetic

Question 23

there is a sequence of eruptive event, often with a cyclic variation in lava types

Answer 23

polygenetic

Question 24

mode of succession of wide sheets of volcanic rocks, built by repeated outpourings of basaltic lava

Answer 24

lava shield

Question 25

central eruptions on a still smaller scale may give rise to simple straight-sided cones

Answer 25

lava cone

Question 26

have no sign of a crator, but are gently sloping mounds, they may owe their shape to erosion although they never had pronounced craters but had lava welling right to the brim before solidification

Answer 26

lava mounds

Question 27

viscous lava is extruded, it sags and spreads into convex dome-like bodies

Answer 27

cumulo-dome / mamelon

Question 28

cumulo-domes or mamelons when they occur in the crater of a large volcano

Answer 28

tholoid

Question 29

usually steep small cones

Answer 29

plug domes

Question 30

produced as the last phase of an eruption of larger volcanoes

Answer 30

scoria cones

Question 31

scoria volcanoes have no apparent crater

Answer 31

scoria mounds

Question 32

they form in the interaction between lava flows and water

Answer 32

littoral cones

Question 33

shallow volcanic craters with steep sides that is surrounded y tephra basalt

Answer 33

maars

Question 34

ash, lapilli, blocks, and bombs

Answer 34

pyroclastic ejecta

Question 35

tuffs and agglomerate

Answer 35

lithified deposits

Question 36

nuee ardentes

Answer 36

volcanic clouds

Question 37

welded tuff and ignimbrites

Answer 37

ash flow

Question 38

volcanic ash + water

Answer 38

lahars