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: Autumn brings the changing of the seasons. 
Sentence2: Earth 's tilt on its rotating axis causes autumn.
[A]: Autumn


[Q]: Sentence1: when a gas in an open container evaporates , that gas spreads out into the air. 
Sentence2: when a gas in an open container evaporates gas molecules slamming into one another.
[A]: container


[Q]: Sentence1: unequal heating of Earth 's surface by the Sun causes global wind patterns. 
Sentence2: Unequal heating of Earth's surface by the Sun can cause some geographical areas to evolve into deserts.
[A]:
Earth