Test two

Question 1

Mount Pelee

Answer 1

Proclastic flows into St. Pierre, so fast it skipped across the ocean and into the harbor.

Question 2

Krakatoa

Answer 2

Composite volcano, sound of explosion could be heard over 3,100 miles. over 36,000 died mostly by tsunami

Question 3

Nevado Del Ruiz

Answer 3

Lahar killed over 20,000 people - 1985

Question 4

Mount Rainier

Answer 4

People are living in Lahar pathways, lava flows, and pyroclastic flows. Stratovolcano with viscous lava

Question 5

Tambora, Indonesia

Answer 5

was 13,000 ft tall, after explosion 8,700 ft tall. 4 mile wide caldera, 10,000 died from pyroclastic flow, 17,000 through disease and famine. Year without a summer.

Question 6

Lake Nyos

Answer 6

accumulated and released immense voumes of carbon dioxide. Gas is now slowly vented out. Killed 3,000 cattle and many people

Question 7

Yellowstone

Answer 7

Is a huge caldera. Mantle plume located below North American plate (NW Wyoming)

Question 8

Vesuvius

Answer 8

a deadly combo

Question 9

Mauna Loa

Answer 9

Largest shield volcano in the world

Question 10

Pillow Basalt

Answer 10

bulbous or pillow shaped blobs from lava cooling underwater

Question 11

define pyroclastic material

Answer 11

Molten and solid materials ejected upward and outward

Question 12

Temperature of basaltic lava is?

Answer 12

hot! higher than all others

Question 13

SiO4 content

Answer 13

pyramid shaped molecules, form crystals as magma cools. Lots of crystals with cooler temperature magma.

Question 14

Viscosity is affected by…

Answer 14

Temperature, SiO4 content, volatiles

Question 15

low gas content, low viscosity produces?

Answer 15

lava flows

Question 16

high gas content, low viscosity produces?

Answer 16

lava fountains

Question 17

Low gas content, high viscosity produces

Answer 17

very slow flow

Question 18

high gas, high viscosity

Answer 18

Explosive!

Question 19

Classify volcanoes based on…

Answer 19

shape and composition, relative activity, eruptive sytle

Question 20

what is a shield volcano?

Answer 20

a broad, gently sloping volcanic mountain composed of basaltic lava flows

Question 21

what is a cinder cone?

Answer 21

a small, very steep sloping volcano made up of pyroclastic material.

Question 22

what is a composite volcano?

Answer 22

a large, steep, cone-shaped volcanic mountain composed of alternating layers of lava flows and pyroclastic material

Question 23

what is a lava dome?

Answer 23

a small, dome or irregular shaped volcano composed of thick, viscous rhyolitic magma and lava

Question 24

what is a flood basalt?

Answer 24

a vast accumulation of layers of basalt which may cover thousands of square miles. found at mid-ocean spreading centers or on continents as fissures.

Question 25

what is an active volcano?

Answer 25

volcano is erupting, or is expected to soon.

Question 26

What is a dormant volcano?

Answer 26

not presently active, but it has erupted during recorded history. still attached to a source of magma

Question 27

what is an extinct volcano?

Answer 27

not erupting, is no longer connected to a source of magma

Question 28

divergent boundaries have...

Answer 28

low SiO4 content, low gas, low viscosity, basaltic magma from mantle

Question 29

oceanic-continental convergent boundaries can produce...

Answer 29

continental volcanic arcs with plug domes or composite volcanoes

Question 30

oceanic-oceanic convergent boundaries can produce

Answer 30

composite volcanoes

Question 31

define a hot spot

Answer 31

an area of volcanic activity above a mantle plume

Question 32

define a mantle plume

Answer 32

a column of very hot magma that rises from the lower portions of the mantle

Question 33

Vestmannaeyjar harbor, iceland

Answer 33

lava flowing from ocean, could block harbor. used fire dept. equipment to cool rock and make a levy

Question 34

define a lahar

Answer 34

a flood of ash, mud, and water that flows down the side of a volcano. Created by melting snow and ice from the warming of a volcano

Question 35

define a jokulhaup

Answer 35

a flood of water caused by volcanic activity under glacial ice

Question 36

define a caldera

Answer 36

a large, basic-shaped depression created when a volcano explodes or collapses.

Question 37

define a tsunami

Answer 37

a very long-wavelength ocean wave caused by oceanic disturbances (earthquakes, volcanoes)