The best and most correct answer among the choices provided by your question is the fourth choice or letter D. Natural run-off from mountain ranges <span>is thought to be most responsible for the salinity of the oceans.
</span>After years and years of river inflow and evaporation, the salt<span> content of the lake water built up to the present levels. The same process made the seas </span>salty<span>. Rivers carry dissolved salts to the </span>ocean<span>. Water evaporates from the </span>oceans<span> to fall again as rain and to feed the rivers, but the salts remain in the </span>ocean<span>.</span>
Heavy water contains 20% hydrogen by mass and 80% oxygen by mass.
<h3>What is the molar mass of heavy water?</h3>
Heavy water is water which contains the heavy isotope of hydrogen, Hydrogen-2 in its molecules.
The mass of heavy water is greater than that of water.
The molar mass of heavy water is 20.0 g
The percentage composition of the elements in heavy water are as follows:
Hydrogen = 2 × 2g/20 g ×100% = 20%
Oxygen = 16g/20g × 100% = 80%.
Therefore, Heavy water contains 20% hydrogen by mass and 80% oxygen by mass.
Learn more about heavy water at: brainly.com/question/2142633
#SPJ1
Answer:
the boys should cover the end of the test tube to a ballon
Explanation:
the second law of thermodynamics
Answer: Option C.
<u>Explanation:</u>
The second law of thermodynamics talks about the concept of entropy. This second law of thermodynamics says that the process or a reaction is always spontaneous.
The second law states about the transformation of energy from one form to the other form of energy. It also talks about that the difference in the temperature, difference in the pressure tends to get equal after a particular period of time.
