Curated OER
Earth is Round
This series of images shows how ancient people figured out that the world was round. Each slide shows a ship moving around the globe and coming closer to the line of the observer's sight. This is a very simple resource that you could use...
Curated OER
How We See Things
In this science worksheet, learners draw arrows, which represent light, on 2 pictures to show how the boy can see the book and the girl can see the picture. They draw arrows showing how light reflects off of mirrors so that the children...