what are the 3 classes of rocks
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what are the 3 classes of rocks
3 classes of rocks
list and describe the 3 main classes of rocks
what are the three classifications of rocks
what are the 3 kinds of rocks
what are the 3 categories of rocks
what are the three kinds of rocks
the 3 main types of rocks
the 3 types of rocks
how are rocks classified into 3 types
the three types of rocks
the three main types of rocks
the three main categories of rocks
list the three classifications of rock
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