The Big Bang theory states that   a. the Earth formed 4.5 billion years ago by the accretion of several small planetesimals.   b. temperatures had to remain above 1 billion degrees in order for atoms to form.   c. the process of atom creation, termed Big Bang nucleosynthesis, produced all known natural elements.   d. nebulae condensed and heated to become spinning accretionary disks, then protostars, then stars

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