GIA Diamonds/Diamond Grading 4-6
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questions with verified answers
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Diamonds |were |delivered |to |the |earth's |surface |as |recently |as
A.
20 |billion |years |ago.
B.
20 |million |years |ago.
C.
1 |million |years |ago.
D.
10,000 |years |ago. |- |✔✔B.
20 |million |years |ago.
The |three |main |components |of |the |earth |are |the |crust, |mantle, |and
A.
core.
B.
center.
C.
stratosphere.
D.
subduction |zone. |- |✔✔A.
core.
How |far |beneath |the |earth's |surface |do |diamonds |form?
,A.
15 |to |30 |miles |(25 |to |50 |kilometers)
B.
30 |to |50 |miles |(50 |to |75 |kilometers)
C.
50 |to |90 |miles |(75 |to |140 |kilometers)
D.
90 |to |140 |miles |(140 |to |220 |kilometers) |- |✔✔D.
90 |to |140 |miles |(140 |to |220 |kilometers)
The |correct |conditions |for |diamond |formation |exist |under
A.
cratons.
B.
volcanic |ash.
C.
oceanic |crust.
D.
large |mountain |ranges. |- |✔✔A.
cratons.
Before |arriving |at |the |earth's |surface, |diamonds |might |remain |in |the |mantle |for |as |long |as |a |few
A.
days.
B.
hours.
C.
hundred |years.
D.
, hundred |million |years. |- |✔✔D.
hundred |million |years.
Scientists |have |found |that |diamonds |form |in |two |types |of |rocks, |called
A.
marble |and |shale.
B.
sandstone |and |schist.
C.
peridotite |and |eclogite.
D.
kimberlite |and |lamproite. |- |✔✔C.
peridotite |and |eclogite.
During |emplacement, |if |diamonds |are |exposed |to |high |temperature |along |with |decreased |pressure |
for |a |long |period, |they |willA.
melt.
B.
explode.
C.
vaporize.
D.
convert |to |graphite. |- |✔✔D.
convert |to |graphite.
The |proper |environment |for |diamond |formation |includes |the |right |temperature, |pressure |and
A.
molten |lava.
B.
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questions with verified answers
| | |
Diamonds |were |delivered |to |the |earth's |surface |as |recently |as
A.
20 |billion |years |ago.
B.
20 |million |years |ago.
C.
1 |million |years |ago.
D.
10,000 |years |ago. |- |✔✔B.
20 |million |years |ago.
The |three |main |components |of |the |earth |are |the |crust, |mantle, |and
A.
core.
B.
center.
C.
stratosphere.
D.
subduction |zone. |- |✔✔A.
core.
How |far |beneath |the |earth's |surface |do |diamonds |form?
,A.
15 |to |30 |miles |(25 |to |50 |kilometers)
B.
30 |to |50 |miles |(50 |to |75 |kilometers)
C.
50 |to |90 |miles |(75 |to |140 |kilometers)
D.
90 |to |140 |miles |(140 |to |220 |kilometers) |- |✔✔D.
90 |to |140 |miles |(140 |to |220 |kilometers)
The |correct |conditions |for |diamond |formation |exist |under
A.
cratons.
B.
volcanic |ash.
C.
oceanic |crust.
D.
large |mountain |ranges. |- |✔✔A.
cratons.
Before |arriving |at |the |earth's |surface, |diamonds |might |remain |in |the |mantle |for |as |long |as |a |few
A.
days.
B.
hours.
C.
hundred |years.
D.
, hundred |million |years. |- |✔✔D.
hundred |million |years.
Scientists |have |found |that |diamonds |form |in |two |types |of |rocks, |called
A.
marble |and |shale.
B.
sandstone |and |schist.
C.
peridotite |and |eclogite.
D.
kimberlite |and |lamproite. |- |✔✔C.
peridotite |and |eclogite.
During |emplacement, |if |diamonds |are |exposed |to |high |temperature |along |with |decreased |pressure |
for |a |long |period, |they |willA.
melt.
B.
explode.
C.
vaporize.
D.
convert |to |graphite. |- |✔✔D.
convert |to |graphite.
The |proper |environment |for |diamond |formation |includes |the |right |temperature, |pressure |and
A.
molten |lava.
B.
