Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Sam was standing on a bridge over a stream. He picked up a rock and threw it in. The rock made a small splash. Sam looked for a bigger rock to throw in. He found a very large rock but he was too weak to lift it.
 selected sentence: The rock made a small splash.

He threw a rock into a stream. >Causes/Enables> The rock made a small splash.