Shadow is a Hedgehog like Sonic the Hedgehog. He died but Dr. Robotnik (Eggman) made a Andriod copy of Shadow the Hedgehog. Shadow is always grumpy. But if he ever forgets who he is he will do anything to get his memory back. Even destroy Sonic the Hedgehog.
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the angle at which a shadow is formed
Well, no trees have a shadow if it is dark, or if they are shaded by a bigger tree. But a family tree may have no shadow.
When the sun is low down, the shadow is longer. If the sun is high up the shadow is shorter.
A shadow is formed when light is blocked by an object.
penumbra The Latin word "umbra" means "shadow". The prefix "pen-" means "almost" or "partly", so "penumbra" means a partial shadow.