Hawaii consists of eight major islands; Hawaii, Maui, Kahoolawe, Lanai, Molokai, Oahu, Kauai, and Niihau. Only six are accessible and four are the most popular with tourists. There is no bridge that connects the islands, you must fly to each island unless there is a ferry provided (Maui to Lanai is the only ferry). The islands were formed by mountains created by the eruptions of volcanoes. When hot lava comes out of the earth from beneath the ocean floor it meets cold water and becomes solid new earth. This “hotspot” is currently located on the Big Island. When a volcano is no longer above the hotspot, the supply of magma is cut off and the volcano becomes dormant. The pacific plate has been moving in a northwest direction approximately half an inch to four inches per year taking each island away from the hotspot. The youngest island is the Big Island, the oldest are Niihau and Kauai. It is estimated that Kauai is between 3.8 and 5.6 million years old, Oahu is 2.2-3.3 million years old, Molokai is 1.3 to 1.8 million years old, Maui is less than 1 million years old and the northwest side of Big Island (furthest from the active hotspot and volcano) is 0.7 million years old and where the lava is still flowing, zero years old. Here is a brief summary of each island.
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Oahu
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