Question

what are the two distinct reasons of a shadow

Answer 1

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━━━━━━━━━━━━━━━━━━━$\mathfrak{\green{Answer.}}$As a result, the path of an object'sshadow through the fog becomes visible as a darkened volume. In a sense, these shadow lanes are the inverse of crepuscular rays caused by beams of light, but caused by theshadows of solid objects.
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Answer 2

Outside, people make shadows when they block light from the sun. Think about what happens when the sun is behind you. Your body blocks some of the sun's light, causing a shadow to form in front of you. The shadow takes on the shape of your body.