Chapter 8 - Volcanoes And Volcanism

Question 0

A depositional mountain landform built from solidified magma from deep in the earth

Answer 0

Volcano

Question 1

______________ are a very good example of a hydrothermal circuit

Answer 1

Geysers

Question 2

Who is Vulcan?

Answer 2

The Roman god of fire

Question 3

What are volcanoes made of?

Answer 3

Igneous rocks

Question 4

What is the vent?

Answer 4

Where the magma erupts from

Question 5

What does the magma turn into when it erupts?

Answer 5

Lava

Question 6

A depression at the top of the cone

Answer 6

Crater

Question 7

Which magma contains less than 52% silica

Answer 7

Basaltic

Question 8

Which magma contains 52-63% silica

Answer 8

Andesitic

Question 9

Which magma contains more than 63% silica?

Answer 9

Rhyolitic

Question 10

Lava with a smoothly wrinkled, ropey surface

Answer 10

Pahoehoe

Question 11

Where does pillow lava form?

Answer 11

Underwater

Question 12

What is a glowing avalanche made of?

Answer 12

A mixture of hot solid particles suspended in water vapor or other gases

Question 13

What is a glowing avalanche also called?

Answer 13

Pyroclastic flow

Question 14

Lahar

Answer 14

A volcanic mudslide caused by the melted snow

Question 15

Vents in the ground where steam and other gases from volcanic activity escape

Answer 15

Fumaroles

Question 16

Ash, cinders, and bombs

Answer 16

Pyroclastic materials

Question 17

A layer of loose pyro clastic materials and ash covering the ground

Answer 17

Tephra

Question 18

What is the Circum-Pacific belt sometimes called?

Answer 18

The ring of fire

Question 19

What processes and absorbs minerals from the water?

Answer 19

Special bacteria

Question 20

Geologists believe what produces great amounts of magma as the subducted plate melts in the mantle?

Answer 20

Subduction

Question 21

Thick layers of igneous rocks that cover many places in the world, including the ocean floor

Answer 21

Flood basalts

Question 22

What are shield volcanoes formed from?

Answer 22

Quiet eruptions of mostly runny, basaltic lavas

Question 23

What are cinder cones formed from?

Answer 23

Eruptions of bursts of gases that eject mostly pyroclastic materials

Question 24

What are stratovolcanoes formed from?

Answer 24

Eruptions that alternately eject lava and pyroclastic materials

Question 25

What are the three types of volcanic activity?

Answer 25

Active, dormant, and extinct

Question 26

What volcano is in Washington?

Answer 26

My. Saint Helens

Question 27

Can a volcano formerly considered dormant or extinct erupt disastrously?

Answer 27

Yes

Question 28

What is the explosively of the VEI based on?

Answer 28

The amount of tephra The height of the ash cloud A descriptive estimate of the explosion

Question 29

What happened during the eruptions of Mt. Tambora?

Answer 29

Wind currents distributed the ash around the world, reducing the amount of sunlight that reached the ground in the Northern Hemisphere

Question 30

List the types of plutons from smallest to largest

Answer 30

Stocks Laccoliths Batholiths

Question 31

The rate of temperature change with depth

Answer 31

Geothermal gradient

Question 32

Continuous, geotheramally driven flow of water

Answer 32

Hydrothermal circuit

Question 33

Minerals which settle or precipitate out when the water cools often produce stepped rock formations called ________________

Answer 33

Terraces

Question 34

A hot spring that forcefully ejects its water from the ground at regular intervals

Answer 34

Geyser

Question 35

What have people used to harness the heat produced by magma intrusions

Answer 35

Geothermal energy

Question 36

How much does geothermal power represent?

Answer 36

0.4%

Question 37

How are sills and dikes positioned

Answer 37

Sills are like shelves and horizontal | Dikes are like walls and vertical

Question 38

Do many places have intrusive heat sources close enough to the surface to be usable?

Answer 38

No

Question 39

T/F it is inexpensive and safe to find good places that offer geothermal energy sources

Answer 39

False