GIA Diamonds-Diamond Grading 4-6
Exam Questions & Answers20
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. - ANSWERS-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. - ANSWERS-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) - ANSWERS-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. - ANSWERS-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. - ANSWERS-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. - ANSWERS-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.
Exam Questions & Answers20
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. - ANSWERS-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. - ANSWERS-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) - ANSWERS-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. - ANSWERS-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. - ANSWERS-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. - ANSWERS-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.
