*** All these sets and more are also included in the Physical Science Mega-Bundle ***From the science clip art sets Atoms, Molecules & Elements, Heat Induced Changes in Matter, Light Energy - Absorb, Reflect, Refract, Mixtures & Solutions and Relative Density, this bundle includes 146 (74 color & 72 grayscale/black line) images.Atoms, Molecules & Elements:● Single atom in blue, single atom in green● Two blue atoms, two atoms 1 blue + 1 green, two green atoms, two atoms 1 orange