How can you use these materials to test whether land or water heats faster? The materials are sand
water
heat lamps
thermometers
cups

Thermometer will make sure for you t know which heats faster

A.(nh4)(2co3)is the correct answer 

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.