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General properties of waves

Electromagnetic radiation and the spectrum of visible light

Sound waves - properties and

Reflection, refraction and diffraction of light, diagrams and explanations

Optics - types of lenses, ray diagrams

The Structure of the Earth , crust, mantle, core and earthquake waves (seismic waves)

The electromagnetic spectrum and astronomy - solar system, cosmology, nuclear fusion and stars

The Big Bang Theory of the Universe, the red-shift and microwave background radiation