Geol. 1403/Cook quiz 5

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GEOL
Chapter 5
Volcanoes
updated 7 months ago by Devalon_N_Burk
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geology, science
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1

The property of a magma that determine whether or not it has high viscosity is its ____.

silica content (SiO2)

higher content=higher viscosity

2

This mineral tends to form first in Bowen's series.

olivine

3

Most sratovolcanoes tend to erupt ____.

andesite

4

This rock is so porous, it often floats on water.

pumice

5

After steam, the most abundant component of volcanic gases is ____.

carbon dioxide

6

Batholiths are composed mostly of what type of rock?

granitic

7

Shield volcanoes are the largest of all volcanoes by what measures?

height, volume, mass, and diameter

8

A volcano that has not erupted in 1000 years, is best described as ____.

dormant

9

Name a pyroclastic material.

volcanic ash

10

Most batholiths are made of ____.

granite

11

The property of a magma that determines whether or not it flows easily is ____.

viscosity

12

This mineral tends to form last in Bowen's series.

quartz

13

Shield volcanoes tend to erupt ____.

basalt

14

The most abundant component of volcanic gases is ____.

steam

15

Most active volcanoes are in the ____.

Circum-Pacific belt

16

One of history's best-known volcanic eruptions was the eruption that destroyed Pompeii in 79 A.D. How was Pompeii destroyed?

It was buried by ash which later hardened into rock.

17

A fiery cloud of hot gases and pyroclastic debris which flows down the side of a volcano is called ____.

a nuee ardente or pyroclastic flow

18

The steep-walled structure formed by the collapse of the top of a volcanic mountain into an underlying magma chamber is called ____.

caldera

19

The Columbia Plateau, in the northwestern U.S., is an excellent example of ____.

deposits of flood basalts

20

The viscosity of magma is primarily controlled by ____.

silica content

21

The most commonly emitted volcanic gas is ____.

water vapor

22

When molten rock reaches the surface its called ____.

lava

23

Molten rock which does not reach the surface is called ____.

magma

24

Mt. Vesuvius, Mt. Fuji, Mt, Rainer, and most of the other well known volcanoes of the world are ____.

stratovolcanoes

25

During its lifetime, a volcano may ____.

collapse to form a caldera, collapse in a catastrophic landslide, or erode away to leave a volcanic neck.

26

A volcanoe that has not erupted in 1000 years is extinct.

false

27

Source of water that forms volcanic mudflows is ____.

melting of the volcano's snow or ice cap, condensation of water vapor from the eruption cloud

28

The least dangerous hazard to human life from volcanoes is ____.

lava flows

29

Which nis most dangerous to humans?

nuee ardente or pyroclastic flow

30

A lava flow with a surface of jagged blocks is termed ____.

aa lava

31

Most calderas form by a ____.

summit collapse

32

An igneous rock possessing mineral grains large enough to be seen without magnification is said to have a ___ texture.

phaneretic

33

What are the two major kinds of igneous rock?

volcanic and plutonic