3. Mark the letter C at two places in the park where the skater's gravitational energy will decrease. Explain your choice.

Sample response: How is pH used to determine if a solution is acidic or basic?

Explanation:

What did you include in your question? Check all that apply.

focuses on the pH scale

suggests a way to measure how acidic or basic a solution can be

allows for observations and an opportunity to look at pH quantitatively and qualitatively