- control agent
- controlling force
- convolute structure
- coolant clarification
- cooling flange
- cooling pond
- coordinate
- coordination
- coordination compound
- coordination link
- coordination number
- coordination reaction
- coordination valence
- coorongite
- copal
- copaline
- copalite
- copious stream
- copolymer
- copolymerization
- coppaelite
- copper are
- copper catalyst
- copper chloride
- copper foil
- copper fumes
- copper group
- copper index
- copper ingot
- copper mining
- copper nickel
- copper ore
- copper powder
- copper protoxide
- copper pyrite
- copper sheet
- copper solution
- copper stone
- copper sulphate
- copper sweetening
- copper tetraoxosulfate
- copper tetraoxosulphate
- copperas
- coppered steel
- coppering salt
- copperish
- coppery
- coprolite
- copying paper
- coquinoid limestone
- coral
- coral island
- coral reef
- corallile
- coralline facies
- cordage
- cordage oil
- cordia
- continuous still
- continuous treating
- contour
- contour interval
- contract drilling
- control point
- controlling interest
- convection section
- conversion catalyst
- conversion unit
- converter reactor
- conveyor engine
- convoy
- cool coke
- coolant
- coolant pump
- cooled
- cooling curve
- control guard
- control room
- controlling step
- conversion
- conveying belt
- convolution
- convulsion
- cooker
- cooling chamber
- cooling frame
- cooling surface
- cooperative emission
- cordierite
- cordite
- cordovan
- core analysis
- core barrel
- core binder
- core breaker
- core drill
- core recovery
- core sample
- core section
- core shell