quiz 2

Question 1

true or false, yellowstone marks the end of a continental hot-spot track

Answer 1

true

Question 2

the tendency of a mineral to break and produce a smooth, carving shell-shaped surface is termed

Answer 2

conchoidal fracture

Question 3

the mantle is composed entirely of …

Answer 3

molten peridotite

Question 4

identify the false statement
- formation of table salt is in mineralogic terms, formation of halite
- formation of table salt takes place when a solution becomes saturated
- formation of table salt is an example of solidification melt
- formation of table salt needs a crystal to begin

Answer 4

formation of table salt is an example of solidification melt

Question 5

identify the false statement:
-Diamonds are brought through the crust in large carrot-shaped structure called pegmatites
–Diamonds have been found in South Africa, India, northwest Canada and the rocky mountains in the united states.
-Diamonds of industrial quality are used as abrasives
-Diamonds that have weathered out of ore bodies can end up in stream gravels
-Diamonds are brought from the mantles to the surface in magma that hardens into kimberlite

Answer 5

Diamonds are brought through the crust in large carrot-shaped structure called pegmatites

Question 6

gemstones are commonly found in pegmatites wich are igneous rocks that are …

Answer 6

exceptionally coarse grained

Question 7

the silica terahedron that forms the backbone of all the silicate minerals is composed of silicon and what other element?

Answer 7

oxygen

Question 8

which of the following minerals is more commonly known as table salt? gypsum, feldspar, halite or quartz

Answer 8

halite

Question 9

a blakc fine grained tabular intrusion between two layers of horizontal sedimentary rock must logically be a:

Answer 9

basaltic sill

Question 10

an unknown mineral scartches glass, has only average specific gravity, and shows no cleavage but does show conchoidal fracture. which of the following could it be? Galena, mica, talc , halite or quartz

Answer 10

quartz

Question 11

define silicates

Answer 11

-are classified on the basis of how the tetrahedrons join and share oxygen atoms
-are a huge category of minerals and include the common minerals quartz and feldspar
-have the sillicon-oxygen tetrahedron as their structural unit
-are a major component of the continental crust

Question 12

bowen’s reaction series

Answer 12

allows geologist to predict what minerals will be grouped in igneous rocks

Question 13

what volcanic features is not related to plate boundary magmatism?

Answer 13

Kilauea, Hawaii

Question 14

solid blocks of wall rocks (sometimes called country rock) may:

Answer 14

-not melt but instead remain as recognizable blocks called xenoliths
-be broken off during a process called stoping
-melt entirely and thus change the chemical composition of the intruding magma
- be broken off by intruding magma

Question 15

the energy of various crystal has been shown by scientist to improve human healthà6

Answer 15

false

Question 16

intrusive igneous rocks

Answer 16

cool slowly and are coarse grained

Question 17

wich of the following is not true about minerals?
-all minerals are compound of more than one element
-all minerals are naturally made
-some minerals are preicipitated by organisms
-all minerals can be expressed as chemical formulas

Answer 17

all minerals are compounds of more than one element

Question 18

granite

Answer 18

-is felsic in composition
-logically could be found in batholith
-is a phaneritic rock
-is the coarse grained equivalent of rhyolite

Question 19

the mineral bronze is produced when humans melt copper and tin together

Answer 19

false, bronze is not a mineral

Question 20

identify the false statement: mafic minerals
-freeze at higher temperature than silic minerals do
-form black or dark-gray rocks
-would be at the top of bowen’s reaction series, crystallizing first out the melt
-are those rich in iron and magnesium
-form rhyolyte and granite

Answer 20

form rhyolyte and granite

Question 21

after an explosive volcanic eruption on an island, the surrounding sea is full of light-gay floating rock. what must this rock be?

Answer 21

pumice

Question 22

calcite is a mineral that can constitute oyster shells and in such cases is an example of which mineral formation?

Answer 22

biomineralization

Question 23

what pair of minerals are polymorphs

Answer 23

graphite and diamond

Question 24

which mineral group composes more than 90% of the minerals of the continental crust?

Answer 24

silicates

Question 25

the bedrock of the Columbia River plateau in Oregon and Washington are flood basalts associated with a mantle superplume

Answer 25

true

Question 26

a rock has a médium-gray, fine grained groundmass with large cystals of plagioclase. true or false : the lava flow that produced was quickly quenched in ocean water

Answer 26

false

Question 27

identify the false statement: magma moves up towards earths surface
-because the weight of overlying rock creates pressure that squeezes it up
- because its less dense than the surrounding rock
-while some of its dissolved volatiles bubble out of solution
-slowly, working its way up through cracks and narrow conduits
-more quickly as it cools and therefore becomes less viscous and more dense

Answer 27

more quickly as it cools and therefore becomes less viscous and more dense

Question 28

window glass is not a mineral because it doesnt have crystal lattice structure

Answer 28

true

Question 29

when you scrape a mineral along a ceramic plate to observe the colour of its powder, you are checking the physical property known as

Answer 29

streak

Question 30

gold and copper can both be found as native metals

Answer 30

true