Answer: Crust, mantle and core 4. Question: How many elements are on the periodic table? Answer: 118 5. Question: What do you call an animal that eats a variety of other organisms, including plants, ...

Scientists have discovered the elusive properties hidden within promethium, a rare earth element that has remained largely ...

For the first time, astronomers have probed the physical environment of repeating X-ray outbursts near monster black holes ...