The oldest known rocks on Earth are 3.96 billion years old. Precambrian ... approximately 4 billion years old ... 3.3- to 3.5-billion-year-old Warrawoona Group ...
Why do we have an atmosphere today? Magnetic field deflects solar wind. Atmosphere ... Chimney. Tube worms found near black smokers. Life at the black smokers ...
... Waterless Early Earth Shortly after accretion, Earth ... continents grew more rapidly along their margins a process called continental accretion as plates ...