Molten Liquid Rock Inside Earth's Mantle Is Called
Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. The outer core is a liquid mix of iron and nickel but the inner core is solid metal. Magma National Geographic Society Magma is a mixture of liquid rock crystals and gas. . Inside the Earth The size of the Earth -- about 12750 kilometers km in diameter-was known by the ancient Greeks but it was not until the turn of the 20th century that scientists determined that our planet is made up of three main layers. Find out more Volcanoes. Magma is the molten rock below the crust in the mantle. The mantle is below the crust and is made of a soft moldable rock. Earths inner core is as hot as the surface of the sunabout 10000ºF 5500ºC. Sometimes hot molten rock called magma bursts through Earths surface in the form of a volcano. These currents cause the movement of the tectonic plates that make up the earths crust. They...