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Earth Science Facts

Micas are silicate minerals that can separate into thin ____. crystals
Rock fragments, mineral grains, and shell pieces are ____. minerals
The Earth's two magnetic ____ move gradually over time. ores
Igneous rocks that cooled slowly have relatively large ____. poles
Most rocks are aggregates (mixtures) of ____. sediments
Profitable minerals (copper, gold, iron) are extracted from ____. sheets
Mineral formations hanging from cave ceilings are called ____. stalactites
Mineral formations rising from cave floors are called ____. stalagmites