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Magma in Earth's Mantle Forms Deeper Than Once Thought. Study simulating pressures in mantle beneath the ocean floor shows that rocks can melt at depths up to 250 kilometers. When magma reaches Earth's surface and erupts from a volcano, it becomes lava.
Granite Cave is a deep cave located within Route 106. This cave has three levels and gets darker as you go through it, requiring Flash. The basements only accessible if you use the Mach Bike.nside the cave, you will encounter Steven Stone and later Zinnia within the deep part of the cave on the first floor, where there are cave paintings showing Primal Groudon & Kyogre.