Why did white limestone have to come by water

Now it's your turn to investigate human impact around the world. grab your virtual lab coat and put on your environmental science hat. you will be taking a trip around the globe to explore three locations. at each location, you will investigate the cause and effect relationships of deforestation, desertification, and urbanization. you will also gather evidence of how these factors have impacted the environment over time

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic