Which of the rock identification characteristics did you find most useful? which of the character did you find least useful? give reasons for your answers comparing and contrasting: how did identifying rocks compare with the mineral identification lab you did in chapter 2? how is identifying rocks different from identifying the minerals that compose the rocks? applying concepts: match the metamorphic rocks with their probable parent rocks applying concepts: choose two pairs of rocks used in this investigation. write a brief description for each pair that explains how one rock can be changed into the other. refer to the diagramed the rock cycle on page 67.