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5
|
Another way of mining for nickel is __________ mining.
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6
|
Nickel is mined in ________, Russia, Canada, Cuba, South Africa and New Caledonia.
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9
|
Nickel does not __________ in plants and animals.
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14
|
The ___________ at which nickel melts is 1452 degrees C.
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15
|
Nickel is rarely found in its ____ form on earth.
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17
|
Nickel is a _______ occuring element.
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18
|
Nickel is mostly found in combination with ____.
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19
|
Approximately ______% of the ore mined becomes waste.
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20
|
Scientists believe that an iron-nickel mix makes up the earth's ______ core.
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21
|
Overburden is the _____ material on top of the ore that is to be mined.
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