| If a rock layer is found that displays faults, what can be inferred about the temperature of the environment in which the faulting took place? | HINT: Under what conditions do rocks display brittle behavior? |
| If a rock layer is found that displays folds, thins in certain places, or appears as a series of separate spindle-shaped bodies, what can be inferred about the temperature of the environment in which these characteristics originated? | HINT: Under what conditions do rocks display plastic behavior? |