| cumulonimbus | storm clouds |
| basin | low area on Earth's surface |
| salinity | saltiness |
| crest | the highest point of a wave |
| trough | the lowest point of a wave |
| breaker | ocean wave that collapses |
| tide | the rise and fall of the sea level |
| photosynthesis | compound produced by light |
| pollutant | a poison |
| radiation | method of transmitting or spreading something |
| stratosphere | atmosphere that contains ozone |
| dew point | temperature at which water vapor condenses |
| cirrus | high altitude clouds |
| cumulus | low-lying puffy white clouds |