HURRY PLEASE!!! ANSWER BOTH PARTS PLEASE

Part B
Plan a controlled experiment to investigate how much the temperatures of cold sand and cold water change when hot water is added to them. Assume you have access to water, sand, containers, ice, a heat source, a scale, and
thermometers. Summarize your experiment in a few sentences.

Part C
For your experiment in part B, which factors would you keep constant?

ok whats the question if not i cannot you i need question and need a thing to answer

sup bro, im dumb, but this is what i found xd

"the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface"