Oops i dont think i meant to do this

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

What are the major types of a chemical compound