A report says that mud and plants found in Hunga-Tonga, the new island in new Pacific, confuse scientists. Dan Slayback, one of the scientists who visited the island, said that he has no idea on where the mud is coming from and why the plants start to grow there. According to National Aeronautics and Space Administration (NASA), birds in the nearby islands fertilized the plants from their dirt. Slayback said that the island has some small black gravels and a sticky light-colored gray mud. He also said that the island goes down during rainfall.