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.
4.6 billion years ago. Earth begins to form as a ball of molten rock. 4.5 billion years ago. Volcanoes erupt gas and steam to form the oceans, and molten rock. 4.2 billion years ago. Earthâs surface cools and the hard outer crust forms. 3.6 billion years ago. The first continents form; life begins on Earth.