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Earth lodge
An earth lodge is a circular, dome-shaped dwelling with a timber frame covered in earth, built by Plains farming tribes such as the Mandan and Pawnee.
Earth observation satellite
An Earth observation satellite is an uncrewed spacecraft that images Earth's surface or atmosphere from orbit, using passive optical sensors and active radar and lidar.
Earth Observing-1
Earth Observing-1 (EO-1) was a NASA satellite launched in 2000 to flight-test new technologies under the New Millennium Program; planned for one year, it operated for 16 years until 2017.
Earth potential rise
Earth potential rise (EPR), also called ground potential rise, is the voltage an earthing system, such as a substation ground grid, attains relative to remote earth during a fault.
Earth pressure balance shield
An earth pressure balance (EPB) shield, or EPB shield, is a tunnelling machine that supports the tunnel face with its own excavated soil, conditioned with additives and pressurized.
Earth pressure balance tunnel boring machine
An earth pressure balance (EPB) tunnel boring machine supports the tunnel face with pressurized excavated soil, widely used in urban soft-ground tunnelling to limit settlement.
Earth Radiation Budget Satellite
The Earth Radiation Budget Satellite was a NASA Earth observation satellite launched in 1984 to measure Earth's energy balance and ozone, reentering in 2023 after 38 years.
Earth Return Orbiter
The Earth Return Orbiter is a European Space Agency spacecraft that would capture a container of Martian samples in Mars orbit and carry it back to Earth.
Earth sensor
An Earth sensor is a spacecraft attitude sensor that determines a satellite's orientation by detecting the Earth's limb against deep space, usually in the infrared.
Earth shelter
An earth shelter is a building insulated with soil heaped against its walls or covering its roof, a technique revived by the 1970s energy crisis.
Earth Simulator
The Earth Simulator (地球シミュレータ) is a series of supercomputers run by JAMSTEC in Yokohama, Japan, for global climate and ocean simulation; built by NEC, its first generation was the world's fastest computer from 2002 to 2004.
Earth tube
An earth tube, or earth-to-air heat exchanger (EAHE), is a buried pipe through which outdoor air is preheated in winter and precooled in summer by the surrounding soil.
Earth-abundant thermoelectrics
Earth-abundant thermoelectrics are thermoelectric materials composed mainly of plentiful, low-toxicity crustal elements, developed as cheaper alternatives to tellurium-based materials; leading sulfides such as tetrahedrite reach figures of merit near 1.
Earth-fill dam
An earth-fill dam is an embankment dam built by compacting successive layers of earth, with an impervious central core and more permeable material on either side.
EarthCam
EarthCam is an American webcam technology company founded by Brian Cury in 1996 and headquartered in Upper Saddle River, New Jersey, known for live public cameras and construction time-lapse services.
Earthian AI
Earthian AI is an Amsterdam startup building small language models for pricing financial risk, which raised a pre-seed round at a $112 million valuation cap in 2026.
Earthing switch
An earthing switch is a mechanical switching device that connects de-energized circuits or high-voltage equipment to earth potential, protecting personnel during maintenance; it is standard in substations and governed by IEC 62271-102.
Earthing system
An earthing system, also known as a grounding system, is the set of conductors and electrodes connecting an electrical installation to earth, ensuring safe fault clearance.
Earthquake bomb
The earthquake bomb, or seismic bomb, is a heavy deep-penetration bomb invented by Barnes Wallis in World War II, including the Tallboy and Grand Slam.
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.
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.
EASA pilot licensing
EASA pilot licensing is the European Union system of flight crew licenses, set by the 2011 Aircrew Regulation, with licenses issued by national authorities of EASA Member States.
EASA U-space Regulation
The EASA U-space Regulation, Commission Implementing Regulation (EU) 2021/664, establishes the European Union framework for managing drone traffic in designated low-level airspace called U-space, applying since 2023.
Ease-off topography
Ease-off topography is a surface-deviation map in gear engineering that shows the normal deviation between a gear tooth flank and the conjugate flank of the mating gear.
East African Breweries
East African Breweries (EABL) is East Africa's leading branded alcohol company, founded in Kenya in 1922, known for Tusker, Uganda Waragi, and Guinness, and listed in Nairobi.
East African campaign (World War II)
The East African campaign of World War II was the fight between British Commonwealth forces and Fascist Italy for Italian East Africa, from June 1940 to 1941.
East African Crude Oil Pipeline
The East African Crude Oil Pipeline (EACOP) is a 1,443 km heated pipeline carrying crude from Uganda's Lake Albert oilfields to a terminal near Tanga, Tanzania.
East Baghdad Oil Field
The East Baghdad Oil Field is a giant onshore oil field about 10 kilometers east of Baghdad, Iraq, discovered in 1974 with roughly 8 billion barrels of proven reserves.
East Bay Municipal Utility District
The East Bay Municipal Utility District (EBMUD) is a publicly owned utility formed in 1923, serving 1.5 million water customers in the East Bay from the Mokelumne River.
East Coast Main Line
The East Coast Main Line (ECML) is a British railway trunk route from London King's Cross to Edinburgh Waverley, 393 miles long, the former route of the Flying Scotsman.