Unit 15

Question 1

Magma

Answer 1

molten material beneath the surface

Question 2

Lava

Answer 2

molten material that encounters the surface (ocean or exposed to atmosphere)

Question 3

Aa Lava

Answer 3

the most common/abundant type; glowing rock; rigid edges and very thick; does not travel quickly; solid

Question 4

Pahoehoe Lava

Answer 4

smooth, thin, liquid, flows relatively fast,

Question 5

Volcanism

Answer 5

named after roman god of dire (volcan), Eruption of molten rock onto the surface of the planet; A volcano is the vent through which magma and gases are discharged. There are violent or gentle eruptions, some self-destruct

Question 6

Krakatau

Answer 6

island volcano; along the Indonesian arc, between Sumatra and java; 1883 eruption (one of the largest eruptions)

Question 7

Shield

Answer 7

not as destructive, very large in height and width, look like a hill or “shield”; layer upon layer of solidified lava flows; tend to have a big crater (caldera)at the top Ex: maunaloa in Hawaii

Question 8

Hawaii

Answer 8

is a hotspot where the mantle is bubbling up to earth’s surface through a crack

Question 9

Cinder Cone

Answer 9

very small volcanoes, only a mile across and 1000 feet high, steep sides, small crater at the top

Question 10

Composite

Answer 10

also known as strato; most destructive (mt saint Helen); very tall; not as wide, moderately steep sides; small crater at the peak

Question 11

HAZARDS

Answer 11

Pyroclastic flow: avalanche of hot gases and material, up to 100mph
Volcanic mud flows (lahars)- result from heavy rain and or snow melt during an eruption

Question 12

Yellowstone

Answer 12

super volcano; strata; a big magma pool underground,