Answer :
Answer:
Option (B)
Explanation:
Oxygen-16 and Oxygen-18 are both an isotope of oxygen. The O-16 is a lighter isotope and it indicates a warmer climate and the O-18 is a heavier isotope and it is a good indicator of colder climate. These differences in the climate occur due to the effects of both the factors namely precipitation and evaporation.
The O-16 isotope being lighter evaporates much rapidly, so in the tropical regions where the temperature is relatively high, there occur a high amount of O-18 in the ocean. In addition to this, when the water vapor starts to condense, it starts to rain and the water droplets produced during rainfall are enriched in the concentration of O-18, as it is much heavier than the O-16.
These amount of O-16 and O-18 are always found to be present in unequal amounts or proportion in the ocean water as these processes such as precipitation and evaporation takes place continuously.
Thus, the correct answer is option (B), which is not true.