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Earth: An electrical connection to the earth, which represents 0 volts or 'ground potential' by way of a metal or conductive rod.

Earthlight (Earthshine): The faint illumination of the dark part of the moon's disk produced by sunlight reflected onto the moon from the earth's surface and atmosphere.

Earthquake: A sudden, transient motion or trembling of the earth's crust, resulting from the waves in the earth caused by faulting of the rocks or by volcanic activity.

Earth Signs: Taurus, Virgo, and Capricorn, which belong to the earth triplicity, symbolizing 'earth' qualities such as stability, solidarity and practicality.

Earthquake Safety Disclosure: By California law, real estate agents or owners are required to prepare a Residential Earthquake Hazards Report disclosing the earthquake safety preparedness of all houses sold in the state.

Alkaline Earth Metal: The Group 2 elements, beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra) form alkaline oxides and hydroxides and are called 'alkaline earth metals'.

Earthflow: A detached mass of soil that moves downslope over a curved failure surface under the influence of gravity. An earthflow is more complex than a slump: it has a higher moisture content and the . . . View Full Definition

Earthiness: Earthiness is a flavor defect deriving from careless, primitive processing that in some contexts may be seen as virtues. Some Harrar coffees sold in specialty stores may have a hint of wildn . . . View Full Definition

Earth-Inductor Compass: One whose indications depend on the current generated in a coil revolving in the earth's magnetic field.

Earth Day: In 1970, Gaylord Nelson of Wisconsin proclaimed April 22 to be 'Earth Day,' he helped give birth to a historic movement. Earth Day 1970 became the largest organized demonstration in US histo . . . View Full Definition