When a rock first formed, it contained 8 milligrams of potassium-40. How much potassium-40 would remain after three half-lives? 1 milligram
O 2 milligrams
O 3 milligrams
O 4 milligrams

What is the statement plant growth is affected by the color light

The image below shows a weather service map. which details best describe this map? check all that apply

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land