How many theories exist about how the earth was formed?

Answer 1

Two hypotheses - The Nebular Hypothesis and The Close Encounter Hypothesis.

Planet formation theories include the Nebular Hypothesis (which is still in the hypothesis stage and not yet a theory) and the Close Encounter Hypothesis (which has been ruled out). The Nebular Hypothesis is reasonably successful in explaining many features of the solar system and has even made verified predictions.

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Answer 2

Luca de

There are a number of theories regarding the formation of the Earth. These include the gravitational collapse theory, the nebular hypothesis, the giant impact hypothesis, and others. Each theory suggests a distinct mechanism or sequence of events that resulted in the formation of the Earth.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.