Answer:
The Silurian period occurred before the Neogene era.
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.
The Law Of Conservation Of Energy stated that energy can be passed from one object to another but it can not be created or destroyed.