In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Question: Would the use of non-acidic tap water instead of acidic vinegar in a reaction produce 
 Answer: fewer hydrogen ions?
A stronger acid produces more hydrogen ions than a weaker acid.

Question: When we lower the temperature of water it becomes 
 Answer: more dense
When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.

Question: Everett went lower and lower to look at the rocks on the cliff. The highest rocks are likely 
 Answer: youngest

Fossils found at the lowest layer of rock would be the oldest, as these would have been buried for the longest time, whereas fossils found closer to the surface would be buried more recently and therefore be younger.