Two internal sources of energy for Earth are A. rotational energy.

B. solar energy

C. geothermal energy

Two internal sources of energy for Earth are solar energy and geothermal energy, meaning the correct answer would be B and C

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.