Definition: Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
Input: Sentence1: rocks interacting with wind over long periods of time causes weathering. 
Sentence2: On Earth, rocks are weathered by wind and water, creating soil and sand.

weathering