but at the same time not always easy to have?
A. Both are nonpolluting and inexpensive to maintain, but their startup costs and limited locations make them difficult to have everywhere they might be needed.B. Geothermal energy may cause unwanted volcanic activity while solar energy is not useful unless the Sun is shining.C. The operating costs of both are too high.D. Geothermal energy can cause pollution, but both geothermal and solar energy are easy to capture.