All articles starting with E
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Earthquake early warning
Earthquake early warning (EEW) detects an earthquake that has already begun and sends alerts giving people seconds to tens of seconds to take protective action before strong shaking arrives.
Earthquake early warning system
An earthquake early warning (EEW) system detects the first, fast seismic waves of an earthquake in progress, alerting people seconds before slower, damaging shaking arrives.
Earthquake engineering
Earthquake engineering, also called seismic engineering, is the civil engineering field covering seismic design of buildings and bridges, retrofit of existing structures, and ground motion hazard evaluation.
Earthquake light
Earthquake light, also called earthquake lightning, is an atmospheric luminous phenomenon, seen as sheet lightning, balls of light, or glows, reported before, during, and after earthquakes since antiquity.
Earthquake location
Earthquake location is the seismological procedure that determines where and when an earthquake started, solving for the hypocenter's coordinates and origin time from arrival times recorded at many stations.
Earthquake prediction
Earthquake prediction is the claim that the date, location, and magnitude of a future earthquake can be specified in advance, which the USGS says is not yet possible.
Earthquake storm hypothesis
The earthquake storm hypothesis, proposed by Amos Nur and Eric Cline in 2000, attributes the Late Bronze Age collapse to a 50-year series of earthquakes.
Earthquake swarm
An earthquake swarm, also called a seismic swarm, is a sequence of earthquakes clustered in a small area with no dominant mainshock, often tied to volcanic or geothermal activity.
Earthquake swarms
An earthquake swarm is a sequence of many similar, mostly small earthquakes clustered in space and time without a mainshock, often driven by fluids or magma.
Earthquake tomography
Earthquake tomography, or local earthquake tomography, is a seismological imaging method that uses earthquake wave travel times to map three-dimensional velocity structure of Earth's interior.
Earthquake zones of India
The earthquake zones of India are four seismic hazard zones, II to V, defined by the Bureau of Indian Standards, with Zone V the most severe.
Earthquakes and floods of 1068 (Xining era)
The earthquakes and floods of 1068 (熙宁地震水灾) were disasters in Hebei during Emperor Shenzong's Xining era, part of flooding that killed roughly a million people after 1048.
Earthrise
Earthrise: the photograph of Earth rising above the lunar horizon, taken by Apollo 8 astronaut William Anders on December 24, 1968 (NASA frame AS08-14-2383), unplanned, and credited with galvanizing the environmental movement and the first Earth Day.
EarthScope
EarthScope was a National Science Foundation earth science program, running 2003 to 2018, that studied the North American continent with USArray, the Plate Boundary Observatory, and SAFOD.
Earthsea
Earthsea is Ursula K. Le Guin's fantasy archipelago, setting of six books from A Wizard of Earthsea (1968) to The Other Wind (2001), centered on Ged, true-name magic, balance, and Taoist themes.
Earthset
Earthset: the apparent setting of Earth below the lunar horizon, seen from a spacecraft passing the Moon's far side. Named widely during NASA's Artemis II flyby of April 6, 2026, echoing Apollo 8's 1968 Earthrise; earlier examples include Zond 7 (1969).
Earthship
An Earthship is a passive solar, earth-sheltered dwelling originated by Taos, New Mexico architect Michael Reynolds in the 1970s, built of rammed-earth-filled tires and designed to supply its own heating, electricity, water, and food.
Earthstar morphology and development
Earthstar morphology and development describes how earthstar fungi are constructed and develop: a three-layered exoperidium splits into rays that lift the spore sac, and raindrops pump spores out passively.
Earthworks
Earthworks: archaeological features from past human activity, positive banks and mounds or negative hollows like hollow ways; surveyed by lidar and plane table, threatened by ploughing, preserved under grass; includes Ohio's Hopewell Ceremonial Earthworks, UNESCO-listed 2023.
Earthworm
Earthworm, terrestrial segmented annelid worm (phylum Annelida), about 6,200 species in anecic, endogeic, and epigeic groups; ecosystem engineer of soils, invasive in northern North American forests, and raised as Eisenia fetida for vermicomposting.
Earthworm body wall and hydrostatic skeleton
The earthworm body wall, a layered sleeve of cuticle, epidermis, setae, and opposing muscle sheets, forms a hydrostatic skeleton that powers peristaltic locomotion and burrowing through soil.
Earthworm circulatory and respiratory systems
The earthworm circulatory and respiratory systems comprise a closed circulatory system with five pairs of aortic arches and respiration through the moist skin, with no lungs or gills.
Earthworm digestive and excretory systems
Earthworms digest soil with a straight alimentary canal running mouth to intestine, and excrete waste through nephridia and the gut, with ammonia leaving mainly via the gut.
Earthworm Jim
Earthworm Jim: 1994 Shiny Entertainment run-and-gun platformer for Sega Genesis, character by Doug TenNapel, published by Interplay; million-seller with sequels, cartoon, and comic.
Earthworm Jim 2
Earthworm Jim 2 is a 1995 run and gun platform game by Shiny Entertainment, the sequel to Earthworm Jim, starring an earthworm in a robotic suit.
Earthworm reproduction
Earthworm reproduction is the process by which earthworms, simultaneous hermaphrodites, mate ventral-to-ventral to exchange sperm, then produce cocoons from which miniature juveniles hatch with no larval stage.
Earthworm Society of Britain
Earthworm Society of Britain (ESB), founded 2009, runs the National Earthworm Recording Scheme for UK and Ireland earthworm records, with soil pit sampling, verification criteria, and open data via NBN and GBIF.
Earthworms as food and feed
Earthworms as food and feed is the use of farmed earthworms, whole or as dried meal, as protein for human diets and for livestock, aquaculture, and pet feeds.
Earwax
Earwax, or cerumen, is the waxy secretion of ear canal glands that protects and cleans the ear. Wet and dry types follow the ABCC11 gene; impaction affects up to 30% of people and is treated with softeners, irrigation, or manual removal.
Earwig
Earwig, order Dermaptera (skin wings): about 2,000 nocturnal insect species with forcep-like abdominal cerci and compactly folding hind wings; omnivores that are orchard predators or pests, harmless to humans despite the ear myth.