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.
Molten material within the Earth is called magma. In simple terms magma can be thought of as molten rock. When magma cools, it solidifies to form rock which is called igneous rock.That is deceptively simple, since the solidification process can be very complex.There 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.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.