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 fa

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.