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These three short online lessons discuss asteroids, comets and meteors.

These two short online tutorials discuss how the earth rotates and then the earth's revolutions.

In the first URL, the YouTube video explains why earth has spring, summer, autumn and winter seasons. The second URL summarizes the key takeaway points.

Other objects in the solar system are discussed in this online textbook viz. asteroids, meteorites, comets and dwarf planets.

Video 1: Introduces the concepts of points, lines, rays and line segments
Video 2: Provides examples of points, lines, line segments and rays
Video 3: Common mistakes made