Final answer:
Cracking in a wall above an opening can indicate mudcracks, which are wider at the top and get progressively smaller toward the bottom. This pattern can indicate the direction in which the crack formed.
Step-by-step explanation:
Cracking in a wall above an opening can indicate mudcracks. Mudcracks are typically wider at the top of the crack and get progressively smaller toward the bottom of the crack. This pattern is a good way-up indicator if you can see a cross-section view of the crack. This can be observed in geological formations where mud has dried and cracked, but it can also occur in man-made structures, such as walls.