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.
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Question: Sentence1: when a gas in an open container evaporates , that gas spreads out into the air. 
Sentence2: If you place gas in an open box it will evaporate and spread out into the air.

Answer: gas


Question: Sentence1: Interest in fossils is worldwide. 
Sentence2: paleontologists study something with worldwide interest.

Answer: Interest


Question: Sentence1: the movement of tectonic plates causes volcanic eruptions. 
Sentence2: Large volcanic eruptions can decrease (reduce)the earth's average temperature by (a) emitting particles into the stratosphere, thereby increasing the albedo.

Answer:
eruptions