The condensation of water vapor formed the early oceans. It is an important part of the water cycle. It is easy to eliminate the other answers in this question. It can't be meteorites, living organisms, or nitrogen.
Convection currents in magma drive plate tectonics. The answer is true.
Answer:
A pH scale is a scale of measurement that describes the level of acidity or alkalinity of a solution.
The pH range of an acid is below 7.0; base is above 7.0, and pure water is 7.0
Explanation:
A pH scale is a scale of measurement that describes the level of acidity or alkalinity of a substance. It reads numerical values from 0 to 14.0 where values of 0 to 6.99 represent acid; 7 represent neutral; and values above 7.0 to 14.0 represent alkaline (base).
The third and fourth one definitely