Asubstance made up of only one atom is a(n)
compound
homogeneous mixture
element
solution

The answer is element. A compound is made up of two or more atoms. A homogeneous mixture is ,well, a mixture so it has at least two atoms. A solution is a mixture as well. So an element is made of only one kind of atom. Have a good day:)

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.