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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.
What to See. The limestone in the cave is more than 500 million years old. There are echinoderm trilobite forms that can be seen in the cave today. It is 6.2 km long. The cave is 20 to 100 m wide. The height varies from 20 to 30 meters.The humidity is between 86% to 96%. The temperature is 10 to 14 C.he cave is in Gangwon province, South Korea. It is near the Samcheok city. It is 40 minutes away by bus if you are at the Samcheok Intercity Bus Terminal. The hike to the cave entrance is 1.3 kilometers.