How long geothermal energy available?
A. Half a year
B. Only in summer
C. Depending on the weather, mostly when it's sunny
D. Always (365 days a year)
Answer: D
How long geothermal energy available?
A. Half a year
B. Only in summer
C. Depending on the weather, mostly when it's sunny
D. Always (365 days a year)
Answer: D