D.) All of the above ...........
==> Infrared waves from the sun, green light from the sun, and X-rays from the sun, all travel through vacuum.
==> Ocean surf waves travel through water.
==> Microwaves in an oven travel first through air, and then later through meatloaf or chicken.
==> Seismic waves (earthquakes) travel through rocks and dirt.
Density equals mass divided by volume so the ball the higher amount of mass has more density than the ball with less mass has less density. (The golf ball has more density than the ping pong ball)
