TASK DEFINITION: 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.
PROBLEM: Sentence1: cold fronts cause thunderstorms as they pass by. 
Sentence2: Thunderstorms create havoc.

SOLUTION: thunderstorms

PROBLEM: Sentence1: adding salt to a solid decreases the freezing point of that solid. 
Sentence2: Water density decreases with temperature and increases with salt content.

SOLUTION: decreases

PROBLEM: Sentence1: All of the animal species on earth are consumers, depending upon producer organisms for their food. 
Sentence2: All organisms are depending on multiple producers for their food.

SOLUTION:
depending