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3
|
Layer of solid rock below the soil
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4
|
Rarest, most durable, and most beautiful minerals
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6
|
Earthquake zone that includes the San Andreas Fault
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7
|
Volcano that will probably never erupt again
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8
|
Group in which a test is performed
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10
|
Type of rock formed when preexisting rocks are altered by heat or pressure
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11
|
Measure of the pull of gravity on an object
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12
|
Type of rock formed when magma solidifies
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14
|
Rocks that have a smooth, glass-like texture`
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15
|
Chemical sediments that result from the evaporation of water
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16
|
Largest group of minerals which compose over 90% of the earth's crust
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17
|
Hard, round structures that form when minerals settle out of water and crystallize around a sand grain or other mineral fragment
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18
|
Well-known chemical sedimentary rock
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20
|
Any mineral that contains a valuable metallic element
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