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: Through weathering, the surface was eroded away, exposing igneous rock. 
Sentence2: Eroding means breaking down rocks from larger whole into smaller pieces of rocks.

eroded