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: Soil Erosion Soil erosion is a natural process. 
Sentence2: wind and rain is a natural process.

SOLUTION: natural

PROBLEM: Sentence1: Viruses contain DNA but not much else. 
Sentence2: viruses contain encoded information but not much else.

SOLUTION: Viruses

PROBLEM: Sentence1: folding an object causes that object to change shape. 
Sentence2: Origami causes an object to change shape.

SOLUTION:
change