Matching Pairs Forces on EarthOnline version This activity will assist you with learning the stresses placed on Earth's crust. Match the descriptions to the pictures. by sandra mccullough 1 The stress that pushes rocks in parallel but opposite directions. 2 The process by which rocks change shape when under stress. 3 The upward fold in a mountain due to compression 4 Stress that stretches or pulls rock. 5 The process where rock layers bend under stress. 6 Stress that squeezes rock together. 7 The bottom fold of a mountain as a result of compression.