When did the process of the earth building begin?

4.6 billion years ago

Explanation:

Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula.

Explanation:

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.