Which characteristic is used to classify metamorphic rocks as foliated or non-foliated?
o grain size
o layer thickness
o arrangement of layers
o arrangement of grains
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The answer is the arrangement of grains

Explanation:

When certain rocks undergo pressure the grains are aligned in a flat layered appearance. They are formed parallel to the source of the pressure. An example of a for a foliated rock is slate. Layers can be seen clearly on slate rock. A non-foliated rock would not have undergone its changes due to pressure or has grains that could not be aligned differently. In this case, heat would be the main cause of metamorphosing. An example of this is marble.