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.

[EX Q]: Sentence1: the emission of sulfur dioxide causes acid rain. 
Sentence2: the emission of sulfur dioxide causes soil weathering.
[EX A]: causes

[EX Q]: Sentence1: Water erosion has similar consequences as wind erosion. 
Sentence2: exposure to water can cause erosion.
[EX A]: Water

[EX Q]: Sentence1: Hair helps to insulate and protect the body. 
Sentence2: Hair is produced by living cells in the hair follicles at the base of each hair.
[EX A]:
Hair