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.
Evaluate the evidence for the Earths structure & plate tectonic theory * A Semi-Molten Outer - core contains a solid inner core with a temperature of 6,000C. * The Mantle - (it surrounds the core) this is largely composed of silicate rocks rich in iron and magnesium.