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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 201 |  | Clay | Fine grained natural soil | Physical sciences | 0 | 0 | 0 |
| 202 |  | Cliff | Tall, near vertical rock face | Physical sciences | 0 | 0 | 0 |
| 203 |  | Climate | Long-term weather pattern of a region | Physical sciences | 0 | 0 | 0 |
| 204 |  | Climate change | Human-caused changes to climate on Earth | Physical sciences | 0 | 0 | 0 |
| 205 | | Climate variability and change | Change in the statistical distribution of climate elements for an extended period | Physical sciences | 0 | 0 | 0 |
| 206 |  | Climatology | Scientific study of climate | Physical sciences | 0 | 0 | 0 |
| 207 |  | Cloud | Visible mass of particles suspended in the atmosphere | Physical sciences | 0 | 0 | 0 |
| 208 |  | Cloud chamber | Particle detector for visualizing ionizing radiation | Physical sciences | 0 | 0 | 0 |
| 209 |  | Coast | Area where land meets the sea or ocean | Physical sciences | 0 | 0 | 0 |
| 210 |  | Cobalt | Chemical element with atomic number 27 (Co) | Physical sciences | 0 | 0 | 0 |
| 211 |  | Color | Perception caused by wavelengths of light | Physical sciences | 0 | 0 | 0 |
| 212 |  | Color theory | Principles to describe the practical behavior of colors | Physical sciences | 0 | 0 | 0 |
| 213 |  | Combustion | Chemical reaction between a fuel and oxygen | Physical sciences | 0 | 0 | 0 |
| 214 |  | Comet | Natural object in space that releases gas | Physical sciences | 0 | 0 | 0 |
| 215 |  | Condensation | Change of state of matter from a gas phase into a liquid phase | Physical sciences | 0 | 0 | 0 |
| 216 |  | Condensed matter physics | Branch of physics | Physical sciences | 0 | 0 | 0 |
| 217 |  | Conglomerate (geology) | Sedimentary rock composed of smaller rock fragments | Physical sciences | 0 | 0 | 0 |
| 218 | Conservation of energy | Law of physics and chemistry | Physical sciences | 0 | 0 | 0 | |
| 219 | Conservation of mass | Scientific law that a closed system's mass remains constant | Physical sciences | 0 | 0 | 0 | |
| 220 |  | Constellation | Group of stars on the celestial sphere | Physical sciences | 0 | 0 | 0 |
| 221 |  | Continental shelf | Coastal and oceanic landform | Physical sciences | 0 | 0 | 0 |
| 222 | Continuum mechanics | Branch of physics which studies the behavior of materials modeled as continuous media | Physical sciences | 0 | 0 | 0 | |
| 223 |  | Convection | Fluid flow that occurs due to heterogeneous fluid properties and body forces | Physical sciences | 0 | 0 | 0 |
| 224 |  | Copper | Chemical element with atomic number 29 (Cu) | Physical sciences | 0 | 0 | 0 |
| 225 |  | Coral reef | Outcrop of rock in the sea formed by the growth and deposit of stony coral skeletons | Physical sciences | 0 | 0 | 0 |
| 226 |  | Coriolis force | Apparent force in a rotating reference frame | Physical sciences | 0 | 0 | 0 |
| 227 |  | Corrosion | Gradual destruction of materials by chemical reaction with its environment | Physical sciences | 0 | 0 | 0 |
| 228 |  | Cosmic distance ladder | Succession of methods by which astronomers determine the distances to celestial objects | Physical sciences | 0 | 0 | 0 |
| 229 |  | Cosmic inflation | Theory of rapid universe expansion | Physical sciences | 0 | 0 | 0 |
| 230 |  | Cosmic microwave background | Trace radiation from the early universe | Physical sciences | 0 | 0 | 0 |
| 231 |  | Cosmic ray | High-energy particle, mainly originating outside the Solar System | Physical sciences | 0 | 0 | 0 |
| 232 |  | Cosmological constant | Value representing energy density of space | Physical sciences | 0 | 0 | 0 |
| 233 |  | Coulomb | SI derived unit of electric charge | Physical sciences | 0 | 0 | 0 |
| 234 |  | Coulomb's law | Fundamental physical law of electromagnetism | Physical sciences | 0 | 0 | 0 |
| 235 |  | Covalent bond | Chemical bond by sharing of electron pairs | Physical sciences | 0 | 0 | 0 |
| 236 |  | Crab Nebula | Supernova remnant in the constellation Taurus | Physical sciences | 0 | 0 | 0 |
| 237 |  | Cretaceous | Third and last period of the Mesozoic Era | Physical sciences | 0 | 0 | 0 |
| 238 |  | Cretaceous–Paleogene extinction event | Mass extinction event about 66 million years ago | Physical sciences | 0 | 0 | 0 |
| 239 |  | Critical point (thermodynamics) | Temperature and pressure point where phase boundaries disappear | Physical sciences | 0 | 0 | 0 |
| 240 |  | Crust (geology) | Outermost solid shell of astronomical bodies | Physical sciences | 0 | 0 | 0 |
| 241 |  | Crux | Constellation in the southern celestial hemisphere | Physical sciences | 0 | 0 | 0 |
| 242 |  | Cryosphere | Earth's surface where water is frozen | Physical sciences | 0 | 0 | 0 |
| 243 |  | Crystal | Solid material with highly ordered microscopic structure | Physical sciences | 0 | 0 | 0 |
| 244 |  | Crystallization | Process by which a solid with a highly organized structure forms | Physical sciences | 0 | 0 | 0 |
| 245 |  | Crystallography | Scientific study of crystal structures | Physical sciences | 0 | 0 | 0 |
| 246 |  | Cubit | Ancient unit of length | Physical sciences | 0 | 0 | 0 |
| 247 |  | Cumulonimbus cloud | Genus of dense, towering vertical clouds | Physical sciences | 0 | 0 | 0 |
| 248 |  | Cumulus cloud | Genus of clouds, low-level cloud | Physical sciences | 0 | 0 | 0 |
| 249 | Curium | Chemical element with atomic number 96 (Cm) | Physical sciences | 0 | 0 | 0 | |
| 250 |  | Cyanide | Any molecule with a cyano group (C≡N) | Physical sciences | 0 | 0 | 0 |
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