Using a boat to get close to the Kamokuna Lava Ocean Entry where the Kīlauea volcano's 61g lava flow enters the Pacific Ocean on the island of Hawaiʻi, in Hawaii. When waves splash the stream of lava, they "explode" in a cloud of steam, hot water, and tephra (molten spatter, tiny glass fragments, and long glass filaments known as "Pele's hair") called a "tephra jet."