Answer:
A negative correlation between the temperature and the amount of snow still on the ground.
A negative correlation between the number of digital photos uploaded to a website and the amount of storage space that is left.
Explanation:
These are the two relationships that are most likely to be causal. Causal relationships are those in which one aspect is the cause of the second one being described. Moreover, a negative correlation is one in which one aspect of the relationship increases while the other one decreases. In the first example, as the temperature goes up, this causes the amount of snow on the ground to go down. In the second example, as you upload more pictures to a website, there is less storage space.