When energy changes from one form to another: 1.its ability to do useful work decreases
2.its ability to do useful work does not change
3.its ability to do useful work increases

change from one form of energy to another

Explanation:

As the name implies, Energy transformation refers to the conversion of one form of energy to another, such that energy is always conserved.

For instance:

- an electric pressing iron convert electrical energy to heat energy;

- a solar panel convert solar energy to electrical energy etc

All these are examples of energy transformation in nature.

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what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements