Why water exists in three states on the earth?

There is a special point called the triple point where all three states of matter coexist. For water this JUST HAPPENS to be near the conditions at the earth surface, roughly 1 bar (pressure), and 25 deg Celsius (temperature). This is why we see all three states of water on earth.

Explanation:

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fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.