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.
About one third of the primitive planet's material sank to the center, and in the upheaval, heating rates increased and most of the planet was liquified. There might well have been an early ocean of molten rock -- a magma ocean more than 100 km deep.