The Earth's inner core is roughly 750 miles thick and it is primarily composed of iron. The iron in the Earth's core reaches temperatures as high as 13,000 degrees Fahrenheit, but remains a solid because of the intense surrounding pressure from Earth's outer layers. The ball-shaped concentration of iron that is the Earth's inner core is always moving, causing all of the planet to be magnetic.
The Earth's inner core is directly beneath the mantle, which is a layer that consists of semi-solid minerals and rocks and a sheet of hot magma. The Earth's crust borders the mantle and is the outer most layer on the planet. The crust is a solid layer that is responsible for supporting all forms of biological life on Earth.Learn More
Marble is a metamorphic rock. This means that it was formed out of another rock after eons of heat and pressure. Marble is formed out of pure limestone.Full Answer >
Lithium was discovered when Swedish chemist Johan August Arfvedson was analyzing petalite in 1817. He discovered that the alkali metal in the petalite had properties unlike the other known elements. One year later, William Brande and Humphry Davy were both able to isolate a pure sample of lithium.Full Answer >
As of 2014, geologists contend that granite is a plutonic rock resulting from deeply buried shale and sandstone that melted, partially melted or metamorphosed, depending on the category of granite in question. Igneous granite forcefully ripped through the Earth's crust, while metamorphic has no evidence of fluidity.Full Answer >
Magma rises to the surface because it is less dense than the surrounding rocks and a structural zone in the Earth's crust enables movement. When it reaches the surface, magma is referred to as lava. Magma may collect under the surface in an area called a magma chamber until it cools and forms igneous rock, or it may escape through the surface in a volcanic eruption.Full Answer >