| Ahuachapán (city, El Salvador) | Cameron International Corp |
| Ahuachapán | Carson, Washington |
| Ahuachapán, Ahuachapán | Center for Architecture |
| Air source heat pumps | Champagne Pool |
| Albuquerque: Travel Guide (city, New Mexico) | Chemical and fertilizer mineral mining, not elsewhere classified (SIC 1479) (industry) |
| Alliant Energy | Chena Hot Springs, Alaska |
| Alvord Hot Springs | Chinameca (volcano) |
| Amcon Distrg Co | chlamydogobius |
| Archaea | Chuck Williamson (businessman) |
| Askja | Clear Lake Volcanic Field |
| Atlantic Bridge | Cloud Cult (Rock Band) |
| Audubon Center of the North Woods | Coal (mineralogy and petrology) |
| availability factor | Colli Euganei |
| Barnwell Industries, Inc | Contact Energy |
| Bay of Plenty Electricity | Convection |
| Beowawe, Nevada | Coso Hot Springs |
| binary cycle power plant | Coso Volcanic Field |
| Birdsville, Queensland | Cougar Hot Springs |
| Blue Lagoon (geothermal spa) | Crack in the World |
| Blue Lagoon (disambiguation) | Craters of the Moon (geothermal site) |
| Blue Lake (Utah) | craters of the Moon (disambiguation) |
| Blueschist | D'Entrecasteaux Islands |
| Boise: Travel Guide (city, Idaho) | Denizli Province |
| Borax Lake chub | Department of Energy Organization Act (1977) |
| Breitenbush Hot Springs | Depletion Allowance (legal term) |
| Brown energy | Deriba Crater |
| buddingtonite | Devil's Hole |
| Buharkent | Devil's Punch Bowl (disambiguation) |
| California Department of Conservation | Diana's Punchbowl |
| Calpine Corporation (Public Company) | Dieng Volcanic Complex |
| <Previous | Next> |
