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.

[Q]: Sentence1: faulting of rock in Earth 's crust causes earthquakes. 
Sentence2: fault movement forms earthquakes.
[A]: earthquakes


[Q]: Sentence1: All frogs are amphibians. 
Sentence2: frogs have permeable skin that easily absorbs substances from the environment.
[A]: frogs


[Q]: Sentence1: if an animal sweats then that animal 's bodily water decreases. 
Sentence2: if an animal sweats it can cause Dehydration.
[A]:
an