The rock samples you encountered while completing this exercise are called hand samples because you can pick them up with your hand and study them. You can also easily examine hand samples with a hand lense, test them for hardness and reactivity to HCI, and feel and heft them. However, some characteristics of each rock group are so diagnostic that you can observe them at a distance and classify the rocks as igneous, sedimentary or metamorphic. Examine the rock outcrops shown and det whether each group is igneous, sedimentary or metamorphic.