According to the map shown, why is geothermal renewable energy resource more often used west of the mississippi river? a) geothermal energy requires high subsurface temperatures that can found east of the mississippi river. b) geothermal energy requires lower subsurface temperatures that can found east of the mississippi river. c) geothermal energy requires high subsurface temperatures that can be found west of the mississippi river. d) geothermal energy requires lower subsurface temperatures that can be found east of the mississippi river.