Where sunlight reaches

1. READ/play the text
2. CLICK the picture (and video)
3. TRY this:

Q1: Which is the shadow and which is the silhouette in the picture above?

[Answer]

Light starts out from a source, such as the Sun or a torch. It then travels in straight lines.

It's much darker where light can't reach directly. We say places like this are in the shade.

If you look towards a source of light when something is blocking the light, you see a dark outline of the object. This is a silhouette. The dark shape the object casts on the ground is a shadow.