Question 1

The word pyroclastic flow is used to describe certain types of volcanic material flow. What does the word mean?

fire fragments or a cloud of searing gas and rock

lava flowing really fast

Water mixed with the lava

gneous rocks of very large size

Question 2

According to the movie "Vesuvius Ancient Rome Documentary " how deep (thick) was the volcanic ash that buried the town?

70 feet

70 meters

70 inches

7 miles

Question 3

Which of the following volcanoes is NOT a composite cone (strata volcano)?

Mount. Rainier, Washington

Glacier Peak, Washington

Mount Fuji, Japan

Sunset Crater, Arizona

Mount Vesuvius, Italy

Question 4

Multiple answer question !

Among the following choices, which three factors play the most significant role in making a volcanic eruption violent?

(three correct answers)

Silica content

Amount of Ferromagnesian

Dissolved Gasses

emprature of Magma

Depth of Magma

Question 5 1 pts

Which of there statements are true?

A. The researchers found that Mt St. Helen has very large scale eruption every 1000 years, and it is not possible for the volcano to have a big eruption in less than 200 years.

B. At present, scientists are not able to predict, when big eruption of Mt St. Helen will take place.

C. Based on the study of rocks of earlier eruption the scientists are able to say that, the 1980 eruption more than 10 times larger than any other eruption happened in last 4000 years.

D. In 1479, A.D., and 1482, there were two very large eruptions, larger than 1980s eruption. So the volcano is capable of producing two highly explosive eruptions in a span of less than three years.

A, B, C and D

A, B and C

only A and C

only B and D

only C and D

only C

Question 6

According to the movie"Vesuvius Ancient Rome Documentary " what was the first warning (17 years before the eruption) that the citizens of Pompeii and Herculaneum had that Mt. Vesuvius was becoming active again?

an earthquake

a thunderbolt

sea monsters crawling up on the shore

there was no advanced warning

Question 7

In mafic magma, when the magma cools slowly underground, the product will be _____; if it cools quickly at the surface, the product will be_?

Basalt; gabbro

Granite; rhyolite

Gabbro; basalt

Rhyolite; granite

Question 8

Which of the following creature survived the 1980 at Mt. Saint Helens eruption, and was the first one to appear in the affected areas?

[answer is in the Mount St. Helen's Movie]

Deer

Northern pocket gopher

Elk

Mouse

Groundhog

Question 9

Which of the followings statements are true?

A. A normal human being can out run the lava flow.

B. Pyroclastic flows are the second most violent events in volcanology after lava flows.

C. On steep volcanoes pyroclastic flows can reach speeds of over 100 miles per hour.

Only A

A and B

A and C

B and C

A , B and C

Question 10

Felsic Lavas have:

Lower Silica: Lower Viscosity

Higher Silica: Higher Viscosity

Lower Silica: Higher Viscosity

Higher Silica: Lower Viscosity

Question 11

A good example of a shield volcano is _____?

Sunset Crater, Arizona

Mount St. Helens, Washington

Crater Lake, Oregon

Mauna Loa, Hawaii

Question 12

The composition of shield volcanoes is typically ?

basaltic

andesitic

felsic

any composition

Question 13

A "clastic" sediment with a grain size between 0.063 and 2 millimeters would be called a _?

Cobble

Sand

Clay

Silt

Question 14

In geologic terminology, the size range of PEBBLES is _?

2-4 millimeters

2-64 millimeters

64-256 millimeters

< 2 millimeters

Question 15

The most common rocks at the Earth's surface are ____?

metamorphic rocks

intrusive igneous rocks

extrusive igneous rocks

sedimentary rocks

Question 16

Which of the following is NOT a CONTINENTAL sedimentary environment?

fluvial

eolian

submarine fan

glacial

Question 17

Alluvial fans are formed when _.

a narrow valley with a steep slope opens in to a wider valley (or a flat land) with a gentle slope (or no slope) .

the physical interaction of flowing water and the natural channels of rivers and streams.

the tidal mouth of a large river, where the tide meets the stream.

when a ridge of sand created by the wind; found in deserts or near lakes and oceans.

Question 18

Which sedimentary rock is composed of calcium carbonate, and was formed from skeletons of tiny sea creatures. Also, was deposited in warm, shallow seas.

Limestone

Sandstone

Chert

Travertine

Question 19

Another word for "chemical" sedimentary rocks is ___?

clastics

sandstones

carbonates and evaporites

conglomerates

Question 20

Which of the following cementing agents in sedimentary rocks would tend to make the rock fizz (effervesce) in dilute HCl?

calcium carbonate (calcite)

silica (quartz)

pyrite

iron oxide (hematite)

Question 21

Sedimentary rocks comprise (make up) roughly _ % by volume of the outer 10 miles of the Earth?

5

1

8

20

Question 22

Sedimentary rocks are economically important because they may contain:

[choose all the correct answers]

Coal

Petroleum

Natural Gas

Iron

Aluminum

Copper

Question 23

Most of the the carbonates (limestone & dolostones) are deposited in what types of sedimentary environments?

continental

dessert

fluvial

oceans

Question 24

Depositional environments associated with streams or rivers are called __?

eolian

nonmarine

fluvial

glacial

Question 25

The main factors that control metamorphic processes are:

The mineral composition of the parent rock

The temperature at which metamorphism takes place

The amount and type of pressure during metamorphism

The types of fluids (mostly water) that are present during metamorphism

The amount of time available for metamorphism

Which of the following statement is NOT true regarding the controls of metamorphic processes?

Mostly sedimentary or igneous rock are parent rocks. In some cases it metamorphic rocks can also be a parent rock.

All minerals are stable over a specific range of temperatures. Mineral stability only depends on the temperature. Quartz is stable fromu environmental temperatures up to about 1800°C.

Pressure is important in metamorphic processes for two main reasons. First, it has implications for mineral stability. Second, it has implications for the texture of metamorphic rocks.

The critical feature of the parent rock is its mineral composition because it is the stability of minerals that counts when metamorphism takes place.

pur-new-sol

Related Questions