Environmental Studies
- constellation diagram
- contessa del vento
- continental rise
- continental slope
- continental South-east Asia floral region
- continental-shelf waves
- continuous variation
- continuum index
- contour current
- contour diagram
- contourites
- controlled pollination
- convective cell
- Convergent Evolution
- Copes rule
- coppice
- coral growth lines
- cord
- corridor dispersal route
- cosmic radiation