Ch.2 Test Bank Docx Rock-Forming Minerals And Rocks

1.

Silicon has an atomic number of 14, meaning that all atoms of silicon have

A)

14 nuclei.

B)

14 neutrons.

C)

14 protons.

D)

14 electrons.

2.

The radioactive isotope of carbon is

A)

carbon 15.

B)

carbon 14.

C)

carbon 13.

D)

carbon 12.

3.

__________ consist of a unique kind of atom.

A)

Chemical elements

B)

Atomic masses

C)

Molecules

D)

Chemical compounds

4.

Ionic bonding occurs in

A)

seawater.

B)

halite.

C)

diamond.

D)

graphite.

5.

__________ precipitates directly from seawater as tiny needle-like crystals, which accumulate on the shallow sea floor as __________.

A)

Calcite; calcite crystals

B)

Halite; evaporite minerals

C)

Aragonite; carbonate mud

D)

Calcite; coral skeletons

6.

In some places, the strontium ion substitutes for the __________ ion within the calcium carbonate crystal structure.

A)

sodium

B)

calcium

C)

chlorine

D)

carbon

7.

In the atomic structure of diamond, each carbon atom is covalently bonded with _________ other carbon atom(s) in the diamond structure shown.

A)

four

B)

three

C)

two

D)

one

8.

The outermost shell of the chlorine atom, prior to bonding with sodium to form a common mineral (NaCl), contains how many electrons?

A)

8

B)

7

C)

6

D)

5

9.

Minerals containing the complex ion SO₄^2– are called

A)

sulfides.

B)

sulfates.

C)

oxides.

D)

silicates.

10.

Of the major mineral groups, the one that is dominant in all igneous, sedimentary, and metamorphic rocks is called

A)

sulfates.

B)

carbonates.

C)

silicates.

D)

sulfides.

11.

Dolomite resembles calcite in many ways, but in approximately half of the sites where there could be calcium ions in dolomite's crystal structure, there is instead a(n) _________ ion.

A)

magnesium

B)

iron

C)

strontium

D)

carbon

12.

Hematite is an example of the major mineral group called

A)

sulfates.

B)

carbonates.

C)

silicates.

D)

oxides.

13.

__________ is a kind of igneous rock that is high in silica and contains two types of feldspars.

A)

Granite

B)

Gabbro

C)

Felsic

D)

Basalt

14.

Coarse grain size (or crystal size) is usually found in

A)

flood basalts.

B)

pillow lavas.

C)

plutons.

D)

tuffs.

15.

Mud is a mixture of

A)

sand and silt.

B)

silt and clay.

C)

pebbles and sand.

D)

pebbles and cobbles.

16.

A sedimentary particle that is 1/128 millimeter in diameter is classified as

A)

clay.

B)

silt.

C)

sand.

D)

pebble.

17.

Of the siliciclastic rocks that have mainly sand-sized grains, the one with at least 25% percent feldspar sand grains is called

A)

arkose.

B)

breccia.

C)

graywacke.

D)

lithic sandstone.

18.

The main chemical process that occurs during lithification is called

A)

compaction.

B)

cementation.

C)

weathering.

D)

evaporation.

19.

Chert can form by biogenic processes (for example, as deposits from silica-rich solutions moving through rock) or by the process of

A)

evaporation of seawater.

B)

direct precipitation from seawater.

C)

compaction and cementation.

D)

Native Americans making arrowheads.

20.

__________ are sediments consisting of nearly spherical grains, which grow in modern seas by rolling around and accumulating aragonite needles on their surfaces.

A)

Oolites

B)

Ooids

C)

Cherts

D)

Coals

21.

What sedimentary structure formed on a beach and is (are) produced by wave motion in water that oscillates back and forth?

A)

Cross-bedding

B)

Ripples

C)

Mudcracks

D)

Graded beds

22.

The average direction of the slope of __________ indicates the general direction of prevailing winds when ancient sands were deposited, thus forming a sand dune.

A)

mudcracks

B)

cross-bedding

C)

graded beds

D)

ripples

23.

This sedimentary structure formed when sediments were exposed to air.

A)

Graded bed

B)

Mudcracks

C)

Cross-bedding

D)

Ripples

24.

__________ is the word used to indicate the levels of temperature and pressure of metamorphism.

A)

Thermometer

B)

Barometer

C)

Assemblage

D)

Grade

25.

The mica-like, green mineral chlorite occurs primarily in

A)

schist.

B)

marble.

C)

gneiss.

D)

slate.

26.

The form of metamorphism that is most closely associated with the heat or “baking” resulting from an igneous intrusions is

A)

a fault-zone.

B)

regional.

C)

hydrothermal.

D)

contact.

27.

When an asteroid strikes the Earth, rocks that border the impact crater are affected by __________ metamorphism.

A)

contact

B)

shock

C)

regional

D)

fault-zone

28.

The type of metamorphism associated with the percolation of hot watery fluids through rock is called

A)

contact.

B)

hydrothermal.

C)

burial.

D)

shock.

29.

Banded iron formations are complex rocks that consist of

A)

oxides, sulfides, or carbonates of iron interlayered with thin beds of chert.

B)

interlayered thin beds of calcite and aragonite, and beds of chert.

C)

interlayered beds of limestone and dolostone, and beds of chert.

D)

thin beds of chemical and biogenic sediments, which are interlayered with chert.

30.

An igneous rock that forms under water is called

A)

pumice.

B)

flood basalt.

C)

pillow basalt.

D)

tuff.