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SCIENCE LT 2 > volcanoes > Flashcards

volcanoes Flashcards

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1
Q

how do magma form

A

heated and pressured rocks

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2
Q

what causes magma to form faster

A

rise in temp

drop in pressure

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3
Q

where do most volcanoes occur

A

divergent and convergent boundaries

hot spots

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4
Q

why have diff types of volcanoes

A

diff magma formation at each type of plate boundary

composition of magma differs in each tectonic setting

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5
Q

determines the types of volcanoes that form and the types of eruption takes place

A

tectonic setting

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6
Q

at what boundary, the litosphere becomes thinner as two plates pull away from each other

A

divergent

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7
Q

a set of deep cracks firm in an area

A

rift zone

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8
Q

what fills the rift zone

A

hot mantle rocks that rises

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9
Q

(1) as the rock rises

A

decrease in pressure

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10
Q

(2) hot mantle rock

A

melt

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11
Q

(3) rocks melt

A

form magma

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12
Q

the magma that reaches earth’s surface

A

lava

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13
Q

what magma rises to the earth’s surface that erupts nonexplosively

A

basaltic magma

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14
Q

the magma that feeds the eruption pools deep underground in a structure called

A

magma chamber

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15
Q

at earth’s surface, lava is released through openings called

A

vents

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16
Q

flowing lava in the interior travels through long, pipelike structures known as

A

lava tubes

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17
Q

molten or liquid like rock within the earth

A

magma

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18
Q

magma thy reaches earth’s surface

A

lava

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19
Q

an opening through which molten (liquid-like) rock flows onto earth’s surface

A

vent

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20
Q

how many central vents does volcanoes always have

A

one

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21
Q

how many smaller side vents can a volcano have

A

several hahaha

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22
Q

types of volcanoes

A

strato
cinder
shield

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23
Q

usually form at hot spots, from non explosive eruption

A

shield

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24
Q

form from explosive eruptions; very steep

A

cinder cone

25
Q

from both explove and non explosive eruptions

A

composite

26
Q

eruptions are mild and can occur several times

A

shield

27
Q

formed from many layers of runny lava

A

shield

28
Q

very wide, not too steep

A

shield

29
Q

biggest type of volcanoes

A

shield

30
Q

example of a shield volcano

A

mauna loa

31
Q

description of magma inside a shield volcano

A

rich in iron an magnesium

very fluid

32
Q

lava flowing out tends to flow great distances

A

shield

33
Q

flowing lava gives the volcano the shape of a gently sloping mountain

A

shield

34
Q

usually form at hot spots from non explosive eruption

A

shield

35
Q

smallest type of volcano

A

cinder cone

36
Q

most common

A

cinder cone

37
Q

made from pyroclastic material

A

cinder cone

38
Q

form a large crater

A

cinder cone

39
Q

explosive!

A

cinder cone

40
Q

magma has large amounts of gas trapped in it

A

cinder cone

41
Q

eruptions are violent and explosive because of all the gas trapped in the magma

A

cinder cone

42
Q

what forms the cone shape of cinder cone

A

large amounts of hot ash and lava thrown out of the vent

43
Q

usually only active for a short time and then become dormant

A

cinder cone

44
Q

cinder cone example

A

paricutin in mexico

45
Q

eruptions between explosive and non explosive

A

composite

46
Q

sometimes have runny lava layers

sometimes have pyroclastic materials

A

composite

47
Q

wide base

steep sides

A

composite

48
Q

composite example

A

mount fuji

49
Q

types of eruptions

A

explosive

non explosive

50
Q

volcanoes that build enough pressure to blow its top, sending pyroclastic material into the air

A

explosive

51
Q

build only enough pressure to allow lava to run down its sides

A

non explosive

52
Q

types of volcanoes

A

active
dormant
extinct

53
Q

erupts often

A

active

54
Q

sleeping
not erupted a long time
but might in the future

A

dormant

55
Q

dead

not erupted in 100,000 yrs

A

extinct

56
Q

can be used as a very fertile soil but also harmful

A

ash

57
Q

resources of volcanoes; energy extraction

A

geothermal

58
Q

a place where lava reaches the surface

A

volcano

SCIENCE LT 2 (5 decks)

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