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: Most soil nutrients are cations. 
Sentence2: decomposition increases the amount of cations in the soil.
[A]: cations


[Q]: Sentence1: Mad Cow disease is a concern. 
Sentence2: pathogens can cause Mad Cow.
[A]: Cow


[Q]: Sentence1: ice wedging is when ice causes rocks to crack by expanding in openings. 
Sentence2: Ice wedging is extremely effective in a moist but cold climate.
[A]:
ice