Chapter 4 fill in the blanks

_______ percent of the world's oil reserves already discovered.

------- is the key factor to the future of energy, food, and economic security

_______ energy is the energy generated by using wind, solar, hydro, tides, etc.

_______ energy cannot be exhausted easily and can be generated at a constant rate for their use over and over again.

_______ energy can be produced or generated through natural processes, at a rate greater than or equal to the rate of their consumption.

_______ energy sources are available only in limited supply.

It takes a long time for _______ resources to be replenished

It takes a long time for _______ resources to be replenished.

_______ is the main constituent of fossil fuels.

A large amount of _______ energy is stored in the fossil fuels.