It is a measure of how acidic/basic a liquid is. The range goes from 0-14, with 7 being neutral. pHs less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
They are all living organisms
Answer:
6.7 minutes
Explanation:
In a solid such as rock, the primary wave can travel at 5 km/sec; it would take 400 seconds, or about 6.7 minutes to travel 2,000 km.
