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193 results for "Great Oxidation Event" — page 2 of 10
W_3_03 — Great Zimbabwe and Southern African Civilizations
Great Zimbabwe, located in southeastern Zimbabwe, was the capital of a prosperous Shona-speaking civilization that flourished from the 11th to 15th centuries CE, and represents the largest stone structure in sub-Saharan
ZH_5_11 — Solar Eclipse as Political Event: Thales, Omens, and Dynastic Legitimacy
Throughout history, solar eclipses — sudden, dramatic, and seemingly unnatural — have been interpreted not merely as astronomical events but as political signs, divine warnings, and instruments of power. The most famous
ZH_5_04 — Precession of the Equinoxes: Hipparchus, Axial Wobble, and the Great Year
The precession of the equinoxes — the slow, continuous westward shift of the equinoctial points (where the ecliptic crosses the celestial equator) along the ecliptic — is one of the most consequential astronomical phenom
ZH_2_04 — Cosmic Cycle Doctrines: Great Year, Yuga, Precession Ages
Many civilizations have conceived of cosmic time as cyclical rather than linear — repeating through grand cycles of creation, decline, and renewal that span thousands or millions of years. The most influential of these d
ZH_2_08 — Astronomical Dating of Ancient Texts and Events
Astronomical dating — the use of recorded or described celestial events (eclipses, planetary conjunctions, solstice positions, heliacal risings, and precessional indicators) to fix the absolute dates of ancient texts and
ZF_1_10 — Meltwater Pulses and Rapid Sea-Level Events
Meltwater pulses — episodes of exceptionally rapid sea-level rise caused by the collapse or rapid melting of continental ice sheets — are the most dramatic events in post-glacial oceanography, with implications for under
E_3_08 — Dansgaard-Oeschger Events and Abrupt Climate Change
Dansgaard-Oeschger (DO) events are rapid climate oscillations during the last glacial period (c. 115,000–11,700 years ago) characterized by abrupt warming of 5–16°C in Greenland within decades — among the most dramatic a
E_3_20 — Dansgaard-Oeschger Events: Rapid Climate Oscillations
Dansgaard-Oeschger (D-O) events are rapid climate oscillations first identified in Greenland ice cores, characterized by abrupt warming of 8–16°C over Greenland within decades, followed by gradual cooling over centuries
E_2_07 — The 4.2 Kiloyear Event — Bronze Age Climate Catastrophe
The 4.2 kiloyear event (~2200 BCE) was a severe, century-scale aridification episode that constitutes one of the most significant abrupt climate changes of the Holocene. Identified through speleothem, marine sediment, an
E_2_15 — Azolla Event and Eocene Arctic Cooling
The Azolla Event (c. 49 Ma, Middle Eocene) refers to a period of approximately 800,000 years during which the floating freshwater fern _Azolla_ bloomed prolifically across the semi-enclosed Arctic Ocean, sequestering mas
E_2_22 — Dansgaard-Oeschger Events: Rapid Climate Oscillations of the Last Ice Age
Dansgaard-Oeschger (D-O) events are rapid climate oscillations that occurred during the last glacial period (~120,000–11,700 years BP), characterized by abrupt warmings of 8–16°C over Greenland within decades (as few as
E_4_09 — Magnetic Pole Reversals and the Laschamp Event
Earth's magnetic field periodically undergoes geomagnetic reversals — events in which the north and south magnetic poles swap polarity. This has occurred at least 183 times in the last 83 million years, with the last ful
E_1_09 — Solar Storms and Miyake Events
The Sun periodically releases enormous bursts of energy — coronal mass ejections (CMEs) and solar proton events (SPEs) — that interact with Earth's magnetosphere and can have devastating consequences for technology-depen
O_1_10 — Carrington Event and Space Weather Threats to Earth
The Carrington Event of September 1–2, 1859 was the most intense geomagnetic storm in recorded history — caused by a massive coronal mass ejection (CME) from the Sun that struck Earth's magnetosphere approximately 17.6 h
O_2_12 — Great Rift Valley: Continental Splitting and Hominid Cradle
The East African Rift System (EARS) — commonly called the Great Rift Valley — is one of Earth's most geologically dramatic and scientifically significant features: an active continental rift zone stretching approximately
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
D_3_15 — Great Enclosure of Great Zimbabwe: African Monumental Architecture
Great Zimbabwe — a medieval stone city near Masvingo in southeastern Zimbabwe — is the largest and most architecturally sophisticated pre-colonial stone structure in sub-Saharan Africa south of the Sahara. The site compr
D_3_22 — Great Serpent Mound: Astronomical Analysis and Cultural Context
The Great Serpent Mound is a 411-meter-long (1,348 ft) serpentine effigy earthwork in Adams County, Ohio, situated on a plateau overlooking Brush Creek — the largest surviving effigy mound in the world. The mound takes t
D_3_04 — Great Wall of China — Engineering, Mythology, and Function
The Great Wall of China is not a single wall but a vast network of fortifications built, rebuilt, and extended over 2,500+ years by multiple dynasties, stretching a combined total of approximately 21,196 km according to
P_1_18 — Process Philosophy: Whitehead, Event Ontology & Becoming
Process philosophy — the metaphysical tradition holding that reality is fundamentally constituted by processes, events, and becoming rather than by static substances or enduring matter — reaches its most systematic expre
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