What if I told you that Oxygen was not even 30% of our atmosphere? What other gases do you think make up or atmosphere? What gas do you think makes up most of our atmosphere?

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

What are several ways to reduce the effect of friction