Streaming video is a wonderful tool for the the classroom. It can complement the curriculum and gives students the opportunity of see in motion what they are learning in the classroom.
One of the science objectives for 3rd grade is that forces in the Earth produce changes. That the Earth is very hot and liquid in its interior can be changeling to explain. However, volcanoes give us proof of it. Here is a video from the 2010 eruption in Iceland, that disrupted air traffic all over the world for several weeks. The photograph on the video may be a little misleading, it looks like a nuclear detonation.
Life cycles are another item that is taught in science. A video will show them as gradual changes, rather that a sequence of stages. In this video, we can see an animation of the life cycle of a frog, including female frog producing the eggs and the male fertilizing them. I am not sure appropiate for 3rd graders, but very illustrative.
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