7th grade homework 1.16.22019

Read this article on knuckle-cracking and answer the following questions on a separate sheet of paper:

1. What do some scientists think causes knuckle-cracking?

2. Explain what it means when a bubble implodes.

3. Identify the question the scientists conducting this recent study had.

4. When you crack you knuckles, do 100% of the gas bubbles inside implode? EXPLAIN.