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.
***iron and 10% sulphur (S) and/or oxygen ***molten ***30.8% of Earth's mass ***depth of 2890-5150 kilomters (1806-3219 miles) ***37000 C ***convection motion within this region, along with the rotation of the Earth creates an effect that maintains the Earth's magnetic field.