The total amount of energy before and after a chemical reaction is the same. thus, energy is a. conserved. b. created. c. destroyed. d. the same as mass.

A. conserved

Explanation: According to the law of conservation of energy, energy can neither be created nor be destroyed, and remains conserved. The energy is transformed from on form to another.

For example: When coal is burnt, the chemical energy stored in the bonds of carbon are converted to light and heat energy.

The mechanical energy of the wind is converted into electrical energy by the use of turbines.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.