Glossary beginning with R
- Raccoon
- Radiating impacts
- Radiocarbon Dating
- Radiolarian Chert
- Radiometric Age
- Radiometric Dating
- Recessional moraines
- Reclamation
- Red Fox
- Redwood
- Rehabilitation
- Relative Dating
- Relative humidity
- Relief
- Remediation
- Resilient ecosystem
- Resilient soil
- Restoration
- Revegetation
- Rhizopod
- Rhizosphere
- Rhyodacite
- Rhyolite
- Riffle
- Ring of Fire
- Ringtail
- Riparian area
- Riprap
- River corridor
- River otter
- River Protection Overlay
- Riverine
- Rockfall
- Rockfall shadow zone
- Rudist
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