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Classifying Galaxies
Which characteristic is used to classify galaxies?
the size of the galaxy
the shape of the galaxy
the presence of dust and gas between stars
the presence of active star formation sites

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.

You will hear a hissing sound because of the carbon dioxide escaping the can or bottle