Problem: What are the most important words?
glaciers carve out a deep valley in the mountains
Answer: glacier, mountain, valley

Problem: What are the most important words?
environments these are the surroundings and the conditions under which an organism lives .
Answer: environment, organism, surrounding

Problem: What are the most important words?
small pond with pretty yellow flowering water lilies and green lily pads floating on the surface of the water
Answer:
float, lily, pad, pond