Assuming that it will rain when the sky is cloudy and dark is an example of a(n)

Prediction

Explanation:

A prediction is a statement about a future event. Although the future is always unpredictable, predictions try to take present knowledge or experience and guess what the future might be based on this. Therefore, a prediction can be particularly useful when it comes to making future plans or decisions.

which fault and or fold did you find most difficult to diagram