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.
The Earth has two poles, the north pole and the south pole that behave like giant magnets. The rock on the ocean floor contains iron. The rock began as molten material that co â¦ oled and hardened. As the rock cooled, the iron bits inside lined up in the direction of Earth's magnetic poles.This locked the iron bits in place, giving the rocks a permanent magnetic memory.onfidence votes 52. molten material rises and erupts at the same time older rock on the ocean floor moves outward on both sides of the ridge. As material cools it forms a strip of solid rock in the center of the ridge.