QQQ has huge tech exposure, but it is not a 'tech fund' in the pure sense either. The fund's arcane weighting rules further distance it from anything close to plain vanilla large-cap or pure-play tech coverage.
During the time when Earth was forming and was in a molten state, heavy materials like iron and nickel sank to the center of the Earth's mass and lighter materials floated to the surface of the mass. The very center of what we call the core, is solid in the middle because of the increased pressure in that region.
Magma. Magma is the term used to describe molten material within the Earth; in simple terms: molten rock. But the molten rock usually contains some suspended crystals or dissolved gases. Igneous rocks form through the crystallization of magma.here is a considerable range of melting temperatures for different compositions of magma. Upon cooling from the completely molten state, it is typical for silicon tetrahedra to form first, and they in turn join with each other and other ions to form the nuclei for crystal growth.