Earth science
Articles about geology, climate, oceans and the planet.
Pressure gradient
Pressure gradient (fluid dynamics and meteorology)
Prospecting
Proterozoic
Proterozoic Eon: geology, climate, and the rise of complex life
Prudhoe Bay Oil Field
Puddingstone
Pumice
Pyrite
Pyrite (Fool's Gold): Properties, Formation, Uses, and Hazards
Pyroclastic flow
Pyroclastic flow (pyroclastic density current)
Pyrolusite
Pyrolusite (natural manganese dioxide mineral)
Pyroxene
Pyroxene (rock-forming inosilicate minerals)
Quartz
Quartzite
Quaternary
Quaternary (geologic period)
Quicksand
Quicksand: formation, properties, safety, and cultural perceptions
QuikSCAT
Rain and snow mixed
Rain and snow mixed (rain–snow mix)
Rain gauge
Ranger Uranium Mine
Ranger Uranium Mine — site, history, and controversies
Rapid deepening
Rapid deepening of tropical cyclones
Red beds
Red beds: oxidized continental sedimentary rocks and their significance
Relative dating
Relative humidity
Rhyacian
Rhyacian: Palaeoproterozoic period (2.30–2.05 billion years ago)
Rhynie chert
Rhyolite
Rhyolite (high-silica volcanic rock)
Rhythmite
Rhythmite (rhythmic sedimentary layering)
Richter scale
Ridge (meteorology)
Riebeckite
Riebeckite (including crocidolite, or blue asbestos)
Rift (geology)
Rift (Geology): Formation, Types, and Significance
Robert Berner
Rock (geology)
Rock (geology) — types, formation, and significance
Rock cycle
Rock flour
Rock flour (glacial flour): formation, properties, and uses
Rodinia
Rose rock
Rose rock (barite rose) — Oklahoma state rock
Royal Tyrrell Museum of Palaeontology
Royal Tyrrell Museum of Palaeontology — Alberta's premier fossil museum
Sahara pump theory
Saharan Air Layer
Saharan Air Layer (SAL)
Sakurajima
Sakurajima — active volcano in Kagoshima, Japan
Salinity
Salinity (concentration of dissolved salts in water)
Salt mine
Salt mine: geology, methods, history and uses
Salt water
San Andreas Fault
Sand
Sand: composition, formation, uses, and environmental concerns
Sandstone
Schist
Schist — Foliated Metamorphic Rock Rich in Platy Minerals
Sea breeze
Sea breeze — coastal onshore winds and their effects