As with igneous and sedimentary rocks<span>, </span>metamorphic rocks<span> are </span>classified<span> on the basis of texture (grain size, shape, orientation) and mineral composition. However, the classification of </span>metamorphic rocks<span> is more difficult to get into than with igneous and sedimentary </span>rocks<span>, for a couple of reasons.</span>
Metamorphic rocks are classified as either foliated or nonfoliated . Foilated rocks have layers of mineral grains. Nonfoliated rocks have little or no layering. ( just took the test)
In exothermic reactions, the products have higher energy than the reactants, and in endothermic reactions, the reactants have higher energy than the products.
