Choose the best answer.

Not able to be used up defines _____.
inexhaustible
hydroelectricity
isolated
geothermal
chemical

Choose the best answer.

Not able to be used up defines _____.
inexhaustible
hydroelectricity
isolated
geothermal
chemical

inexhaustible

The best answer is "inexhaustible".

The best answer that matches the definition of "not able to be used up" is "inexhaustible."

To arrive at this answer, you can eliminate the other options by considering their meanings:

- Hydroelectricity: This term refers to electricity generated by hydropower, which is not necessarily inexhaustible.
- Isolated: This term means to be separate or far away from others, it is not related to being used up or not.
- Geothermal: This term refers to the heat generated from the Earth's core, and while it is a renewable source, it is not necessarily inexhaustible.
- Chemical: This term refers to substances produced by or used in chemical processes, and it doesn't specifically relate to being used up or not.

By analyzing the definitions, "inexhaustible" is the most suitable choice as it directly implies not being able to be used up.