Meals, Ready to Eat" are an instant hot meal developed by the U. S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an

astronomers such as edwin hubble.

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.

the answer to your question is c