O_2_10 — Earth's Inner Core: Structure, Rotation, and Seismic Shadow Zones

Earth's inner core — a solid sphere approximately 1,220 km in radius at the center of the planet, composed primarily of an iron-nickel alloy at temperatures of ~5,000-6,000°C and pressures exceeding 330 GPa (~3.3 million

O_2_22 — Carolina Bay Anomalies

The Carolina bays are a collection of approximately 500,000 shallow, elliptical depressions concentrated along the Atlantic Coastal Plain of the southeastern United States, from New Jersey to northern Florida, with the h

O_2_06 — Richat Structure — Saharan Eye and Atlantis Claims

The Richat Structure (also called the Eye of the Sahara or Guelb er Richat) is a prominent circular geological formation approximately 40–50 km in diameter located on the Adrar Plateau in west-central Mauritania (21°07′N

O_2_01 — Volcanism, Supervolcanoes, and Geological Catastrophism

Volcanic eruptions are among the most powerful forces on Earth, capable of altering global climate, triggering mass extinctions, collapsing civilizations, and imprinting themselves on human mythology for millennia. The T

O_2_18 — Ball Lightning and Earthquake Lights: Anomalous Atmospheric Luminosities

Ball lightning and earthquake lights (EQL) represent two of the most enduring unsolved problems in atmospheric and geophysics. Ball lightning — luminous spheres typically 10–50 cm in diameter, persisting for seconds to m

O_2_15 — Moeraki Boulders & Septarian Concretions

The Moeraki Boulders (Te Kaihinaki in Māori) are a group of approximately 50 large, near-spherical septarian concretions exposed on Koekohe Beach, near Moeraki on the Otago coast of New Zealand's South Island. Ranging fr

O_2_07 — Anomalous Animal Behavior Before Earthquakes and Storms

Reports of anomalous animal behavior preceding earthquakes and severe weather events span millennia and cultures: the earliest known written account dates to 373 BCE (Diodorus Siculus describing rats, weasels, snakes, an

O_2_08 — Weathering, Erosion, and Deep Time Landscape Evolution

Weathering (the in-situ breakdown of rock and minerals) and erosion (the transport of weathered material by water, wind, ice, and gravity) are the fundamental surface processes that, operating over deep time (millions to

O_2_16 — Mineralogy and Petrology

Mineralogy — the study of minerals (naturally occurring, inorganic crystalline solids with definite chemical composition) — and petrology — the study of rocks (aggregates of minerals) — together provide the foundation of

O_4_13 — Rainbow Mountains: Zhangye Danxia and Chromatic Geology

The world's "Rainbow Mountains" — strikingly multicolored geological formations displaying vivid bands of red, orange, yellow, green, blue-gray, and white rock — represent some of Earth's most visually spectacular natura

O_4_01 — Anomalous Zones: Skinwalker Ranch, Bermuda Triangle & Window Areas

"Anomalous zones" — geographic areas with allegedly high concentrations of unexplained phenomena — range from the verified-as-government-studied (Skinwalker Ranch/AAWSAP) to the largely debunked (Bermuda Triangle). Skinw

O_4_02 — Bermuda Triangle & Devil's Sea — Evidence & Explanations

The Bermuda Triangle — a roughly defined area between Miami, Bermuda, and Puerto Rico — became one of the 20th century's most enduring mysteries after a series of popularizations in the 1960s–1970s attributed an unusual

O_4_07 — Natural Nuclear Reactors Oklo

The Oklo natural nuclear reactors are the only known locations where self-sustaining nuclear fission chain reactions occurred naturally — discovered in 1972 in the Oklo and Okélobondo uranium mines, Haut-Ogooué Province,

O_4_04 — Ringing Rocks, Musical Stones & Lithophones

Ringing rocks — stones that produce clear, bell-like tones when struck — have been documented at multiple locations worldwide, formed from rock types with specific mineralogical and structural properties that support mec

O_4_06 — Crystalline Formations and Mineral Caves

Underground crystalline formations represent some of Earth's most visually spectacular geological phenomena, produced by processes ranging from slow mineral precipitation over millions of years to rapid crystal growth in

O_3_04 — Bioluminescence — Deep Sea Light, Firefly Synchrony, and Cultural Significance

Bioluminescence — the production of light by living organisms — is among the most widespread and independently evolved traits in biology, having arisen at least 40 separate times across the tree of life. In the deep ocea

O_3_20 — Microplastics, Nanoplastics, and the Ubiquitous Contamination Crisis

Microplastics — plastic particles smaller than 5 mm in diameter, with nanoplastics defined as smaller than 1 μm — have become the most pervasive anthropogenic contaminant on Earth. Since mass production of synthetic poly

O_3_15 — Blue Holes: Submerged Sinkholes & Marine Geology

Blue holes are submerged sinkholes or vertical cave systems formed in carbonate rock (limestone, dolomite) during periods of lower sea level and subsequently flooded by rising oceans. Named for the deep blue color that c

O_3_00 — Water Aquatic Systems: Subfolder Summary

O_5_01 — Permafrost, Cryosphere, and Frozen Time Capsules

Permafrost — permanently frozen ground covering approximately 25% of the Northern Hemisphere's land surface — is simultaneously a geological archive, a biological deep freeze, and a ticking carbon time bomb. Ice cores ex