Why does dew usually occur at night? simple question, simple answer : )

Water vapour will condense into droplets depending on the temperature. The temperature at which droplets form is called the dew point. When surface temperature drops, eventually reaching the dew point, atmospheric water vapour condenses to form small droplets on the surface. ... Dew is usually formed at night.

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there was a variety of food available on island x, but there were only large seeds and nuts on island y.