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Science Test 4 - review

Across
Rarest gemstone
Rocklike object that is filled with crystals
Only metal that is a liquid at room temperature
Rock that smells like mud when it is wet
Person who studies minerals
Plant and animal remain that have turned to stone
Material that is a very durable artificial rock
Person who explores caves
Type of weathering
Molten rock in the earth's mantle
Lightweight, nonmagnetic, rustproof metal
Most fossils were probably formed during the time of _______
Minerals form a special kind of solid
Oil in its natural state
Down
Radioactive metal used for nuclear power
Underground spring that shoots streams of boiling water and steam into the air
Rare, beautiful minerals that have not been polished
Rock that has often been used to make chalkboards
Decaying plant and animal material
Hardest substance of all
Scientists who study fossils
Form when mud buries a plant or animal and then quickly hardens
Best conductor of electricity
Scientist who studies the structure of the earth
Type of weathering
Material used in pencils instead of lead
Most useful metal