An experiment shows that people respond faster in classifying words related to the sky (for example, clouds) if they appear at the top of a computer screen, and faster for words related to the earth (for example, ground) if they appear on the bottom of the screen. This finding suggests that

The answer is a Semantic Memory

Explanation:

Semantics memory is only where we record general facts and knowledge, not where we record personal experience, by knowing that football is a sport is the same example of being able to recall that the sky refers to being the cloud without having to think too much, which also indicates a common knowledge.