classify rocks on the basis of mode of formation. write three features of each category.
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igneous rocks:
...they contain crystals.
...the bear pores on them.
...they are not arranged in layers.
sedimentry rocks
...they are arranged in the form of layers.
...they are formed due to deposition of sediments.
...they may contain fossils.
metamorphic rocks:
...they are used in formation of precious stones like rubies.
...they are hard and compact.
...they are closely banded structures with interlocking of crystals.
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The three main types, or classes, of rock are sedimentary, metamorphic, and igneous and the differences among them have to do with how they are formed. Sedimentary rocks are formed from particles of sand, shells, pebbles, and other fragments of material.
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