The crust is the outermost layer of Earth, it covers the entire planet. The crust floats on top of the molten mantle. There are two types of crust, the continental crust and the oceanic crust. The oceanic crust is part of the Earth's crust that covers the ocean basins. Its made up of dark-colored rocks made up of basalt. Basalt is a rock that is made up of silicon, oxygen, and magnesium. The density of the oceanic crust is about 3.0 g/cm3. The continental crust has a lower density. The difference in densities allows many normal phenomenon's to occur on and below the surface of the Earth. The oceanic crust floats on top of the mantle. The continental crust covers 40% of the Earths surface. It is made up of granite rock. This rock is filled with aluminum, silicon and oxygen. The continental crust is less dense than the oceanic crust. It has a value of 2.6 g/cm3. The continents stay in place due to the difference in densities in magma between the oceanic crust and the continental crust. The continental crust flows much more freely on the magma.
             With this said a lot of people wonder how does Hawaii still exist? The answer to that is because the volcanic sea mounts in the Pacific Ocean peek their heads above sea level and continue to grow. Hawaiian islands are still growing because the Hawaiian Islands are volcanic in origin. Each island is made up of at least one volcano. Hawaii is made up of five major volcanoes: Kilauea, Mauna Loa, Mauna Kea, Hualalai and Kohala. Mauna Loa is the largest active volcano on Earth. Kilauea is currently one of the most productive volcanoes on Earth, in terms of how much lava is produced each year.
             In general, when you move along the island chain from East to West, the volcanoes become older and older. The two volcanoes that make up Oahu have not erupted for over a million years. The way the islands are built on the moving sea floor of the North Pacific Ocean determine th
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