How do scientists believe the Earth formed

Formation. When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Like its fellow terrestrial planets, Earth has a central core, a rocky mantle and a solid crust.

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.