**Choose all the answers that apply** Which of the following did Aristotle use to support his theory that the Earth was not flat??

A. different constellations seen by people in the North and South

B. oblate spheroid calculations

C. Earth's diameter

D. satellite images

E. shadow of the Earth during an eclipse

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.