I'm sorry i do not know the answer, but in the picture you took i noticed how it said hint try clicking on that and I also noticed it said chapter 2 at the top of the page if that is a reading source that has information i would read through that or put a link to that so we can read it and see if it helps us get the most accurate answer.
Answer: How to protect the environment
Hills are easier to climb than mountains. They are less steep and not as high. But, like a mountain, a hill will usually have an obvious summit, which is its highest point. According to the U.S. Geological Survey, there is no official difference between hills and mountains.
I won’t be able to help you because you have to show a picture.
