stunning 4 minute video from the "Planet Earth" series showing different seasons and types of weather--great for science or a language lesson on adjectives--time lapse videography is AMAZING! Plus it shows related videos that look pretty good.
TONS of websites for science teachers. The picture I pinned is about plate tectonics which is what our unit is about. There are videos and games that the students can use to learn and practice the material that is covered in class.
One of our favorite water cycle illustrations, especially for younger students. The image of the sun's rays reaching down to draw up water is a great way to represent evaporation. It highlights the driving force of the sun.