Botanically speaking, coconuts are drupes, not nuts. A coconut weighs between 2 and 3 kilograms and is comprised of 4 layers: the outer shell, the husk, the kernel, and the coconut meat. A green coconut is one that has not yet matured, the meat is not fully formed and there is up to one liter of sweet liquid (water) inside. A brown coconut has matured with a decent layer of coconut meat and less liquid. The liquid within the coconut is very clean and is a good source of sterile water in the jungle.