RESEARCH BASE
Search 3,721 documents across 34 fields — every claim tier-rated by evidence
3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.
3,701 results for "H II region" — page 61 of 186
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_17 — Ball Lightning and Plasma Physics: Transient Luminous Phenomena
Ball lightning — a luminous, roughly spherical phenomenon occurring during or near thunderstorms, typically 10–50 cm in diameter, persisting for seconds to minutes, and sometimes reported to pass through solid barriers o
O_2_11 — Impact Craters: Chicxulub, Vredefort, Sudbury, and Crater Morphology
Impact craters — circular depressions formed by the hypervelocity collision of asteroids, comets, or meteoroids with planetary surfaces — are among the most geologically significant features on Earth and throughout the s
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_14 — Slow Earthquakes and Episodic Tremor: Silent Seismic Events
Slow earthquakes — a class of seismic events in which fault slip occurs over days to months rather than the seconds to minutes characteristic of conventional earthquakes — represent one of the most significant discoverie
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_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_03 — Skinwalker Ranch & Multi-Phenomenon Sites
Skinwalker Ranch is a 512-acre property in the Uintah Basin of northeastern Utah that has been the subject of reported anomalous phenomena including unidentified aerial objects, unusual animal behavior and mutilation, po
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_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_05 — Desertification, Green Sahara & Landscape Transformation
Between approximately 11,000 and 5,000 years BP, the Sahara — today the world's largest hot desert — was a green, well-watered landscape of lakes, rivers, and grasslands supporting hippopotami, crocodiles, fish, and larg
O_4_16 — Singing Sands and Booming Dunes: Acoustic Geomorphology
Certain sand dunes and beaches worldwide produce sustained, audible tones — a phenomenon documented since antiquity and reported by travelers from Marco Polo (1295 CE, describing "singing sands" in the Taklamakan Desert)
O_4_12 — Libyan Desert Glass: Silica Mystery and Impact Hypotheses
Libyan Desert Glass (LDG) is a naturally occurring, nearly pure silica glass (~98% SiO₂) found scattered across a roughly 6,500 km² area of the Great Sand Sea on the Egypt-Libya border in the western Sahara Desert. The g
O_4_10 — Megafloods: Missoula, Altai, and Catastrophic Hydrology
Megafloods — catastrophic, high-discharge flooding events far exceeding any observed in historical times — have repeatedly reshaped Earth's surface, carving immense channels, depositing giant ripple marks and boulders, a
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_03 — Cave Systems — Biology, Mythology, and Extreme Environments
Caves represent some of Earth's most extraordinary environments — sealed ecosystems harboring life forms that evolved in total isolation for millions of years, natural laboratories for studying evolution under extreme co
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_17 — Ocean Acoustic Phenomena: The Bloop, the 52-Hz Whale, and SOFAR Channel Mysteries
The ocean produces a rich acoustic environment, and several unexplained or initially mysterious sound detections have captured scientific and public attention since the deployment of deep-ocean hydrophone arrays. [KEY FI
BROWSE BY SECTION — 3,721 documents across 34 fields