| A | B |
|---|
| A horizon | rich dark soil full of organic matter |
| B horizon | zone of accumulation; soil layer with mineral leached from above |
| chemical weathering | decomposition of rock from exposure to water and atmospheric gas |
| C horizon | completely weathered layer laying beneath B horizon |
| clay mineral | a hydrous aluminum silicate with a sheet silicate structure - like mica |
| Differential Weathering | varying rates of weathering due to resistance by different types of rocks |
| E horizon | Zone of leaching; characterized by the downward movement of water |
| erosion | physical removal of rocks by agents like running water or glaciers |
| exfoliation | peeling of layers of rock (also see spalling) |
| exfoliation dome | a large rounded land form developed from massive rock |
