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| 13662971043 | Soil Layers; OAEBCR | O Horizon, A Horizon, E Horizon, B Horizon, C Horizon, R Horizon; Only Apes Eat Bananas Completely Ripe | 0 | |
| 13662971044 | Atmospheric layers from Earth's surface to Space; TSMT | Trophophere, Stratosphere, Mesosphere, Thermosphere; Turtle Sheldon Makes Tea | 1 | |
| 13662971045 | Freshwater zones; LLPB | Littoral zone, Limnetic Zone, Profundal Zone, Benthic Zone; Ladies Love Peanut Butter | 2 | |
| 13662971047 | Four most dangerous indoor air pollutants; CFRP | Cig smoke, Formaldehyde, Radon, small and ultra-fine Particulates; Crazy For Raspberry Pie | 3 | |
| 13662971048 | Six pollutants reduced by Clean Air Act (National Ambient Air Quality Standards); LCVSSN | Lead, Carbon monoxide, Volatile organic compounds, Suspended particulates, Sulfur dioxide, NOx; Little Crazy Vermon Sit Somewhere Now | 4 | |
| 13662971049 | Ranks of Coal; PLSBA | Peat, Lignite, Sub-bituminous, Bituminous, Anthracite; Pink Lemons Seem Barely Acidic | 5 | |
| 13662971050 | Major components of air pollution; SPLONC | Sulfur Dioxide, Particulates, Lead, Ozone, Nitrogen Dioxide, Carbon Monoxide; Some Pollution Lands on Nature Constantly | 6 | |
| 13662971051 | Causes of extinction; HIPPCO | Habitat destruction/fragmentation, Invasives, Population, Pollution, Climate change, Overharvesting; HIPPCO | 7 | |
| 13662971052 | Green Revolution factors; FIG | Fertilizers and pesticides, Irrigation, Genetically Engineered Plants; FIG | 8 | |
| 13662971053 | Categories of Pathogens; VBFPP | Viruses, Bacteria, Fungi, Protozoa, Parasitic Worms; Very Bad For Pretty People | 9 | |
| 13662971055 | Factors of Water Quality; PHDTB | pH, Hardness, DO, Turbidity, BOD; People Have Dirty Trash Bins | 10 | |
| 13662971056 | Four types of waste; TRIC | Toxic, Reactive, Ignitable, Corrosive; TRIC | 11 | |
| 13742835070 | Soil Particle Sizes from Largest to Smallest; GSSC | Gravel, Sand, Silt, Clay; Good Students Study Carefully | 12 | |
| 13742840848 | The Big 3 Water Use Categories | Agriculture, Industry, Municipalities; AIM | 13 | |
| 13747486336 | Stages of the Demographic Transition Model; PTIP | Pre-Industrial, Transitional Industrial, Post-Industrial; Please TIP | 14 |
