Glossary beginning with C
- Cactus
- Caecilians
- Cahuilla
- Calcareous
- Calcareous Nannofossils
- Calcareous Nannoplankton
- Calcite
- Caldera
- Cambium
- Cambrian
- Campanian
- Carbonate Rock
- Carboniferous
- Cartilaginous Fishes
- Catchment
- Cations
- Cenomanian
- Cenozoic
- Chaparral
- Chert
- Chlorophyll
- Cholla
- Chuckwalla
- Chuparosa
- Cinder Cone
- Cirque
- Cladocera
- Clastic
- Cleavage
- Coastal Lagoon
- Cobble
- Coccoliths
- Colluvium
- Colorado Desert
- Colorado Plateau
- Conglomerate
- Coniacian
- Contact Metamorphism
- Contour Line
- Contour Map
- Cordilleran ice sheet
- Core
- Cornice
- Couloir
- Coyote
- Crater
- Craton
- Creosote
- Cretaceous
- Crownsprout
- Cryptobiotic Soil and Crusts
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