Earthflow: A detachment of soil and broken rock and its subsequent downslope movement at slow or moderate rates in a stream- or tongue like form.

Earthquake: The violent oscillatory motion of the ground caused by the passage of seismic waves radiating from a fault along which sudden movement has taken place.

Ebb tide: The part of the tide cycle during which the water level is falling.

Echo-sounder: An oceanographic instrument that emits sound pulses into the water and measures its depth by the time elapsed before they return.

Ecliptic: The plane that contains the Earth's orbit around the Sun.

Eclogite: An extremely high-pressure metamorphic rock containing garnet and pyroxene.

Ecology: The science of the life cycles, populations, and interactions of various biological species as controlled by their physical environment, including also the effect of life forms upon the environment.

Elastic rebound theory: A theory of fault movement and earthquake generation that holds that faults remain locked while strain energy accumulates in the country rock, and then suddenly slip and release this energy.

Electrical engineering: referred to as electrical and electronic engineering, is a field of engineering that deals with the study and application of electricity,electronics and electrimagnetism.

Electron: A negatively charged particle with negligible mass orbiting around the nucleus of an atom.

Elevation: The vertical height of one point on the Earth above a given datum plane, usually sea level.

Elliptical orbit: An orbit with the shape of a geometrical ellipse. All orbits are elliptical or hyperbolic, with the Sun occupying one focus.

Eolian: Pertaining to or deposited by wind.

EMPLOY:to hire or engage the services of (a person or persons); provide employment for; have or keep in one's service

ENGINEER:person professionally engaged in a field of engineering. Engineers are concerned with developing economical and safe solutions to practical problems, by applying mathematics and scientific knowledge while considering technical constraints

Engineering:is the discipline of applying scientific knowledge and utilizing natural laws and physical resources in order to design and implement, materials,structures,machines,devices,systems and processes that safely realize a desired objective and meet specified criteria.

Eon: The largest division of geologic time, embracing several Eras, for example, the Phanerozoic, 600 m.y. ago to present); also any span of one billion years.

Epicenter: The point on the Earth's surface directly above the focus or hypocenter of an Earthquake.

Epoch: One subdivision of a geologic period, often chosen to correspond to a stratigraphic series. Also used for a division of time corresponding to a paleomagnetic interval.

Era: A time period including several periods, but smaller than an eon. Commonly recognized eras are Precambrian, Paleozoic, Mesozoic, and Cenozoic.

Erosion: The set of all processes by which soil and rock are loosened and moved downhill or downwind.

Eskar: A glacial deposit in the form of a continuous, winding ridge, formed from the deposits of a stream flowing beneath the ice.

Ethics is a branch of philosophy which seeks to address questions about morality, such as how a moral outcome can be achieved in a specific situation, how moral values should be determined , what moral values people actually.

Eugeosyncline: The seaward part of a geosyncline; characterized by clastic sediments and volcanism.

Eustatic change: Sea level changes that affect the whole Earth.

Eutrophication: A superabundance of algal life in a body of water; caused by an unusual influx of nitrate, phosphate, or other nutrients.

Evaporite: A chemical sedimentary rock consisting of minerals precipitated by evaporating waters, especially salt and gypsum.

Exfoliation: A physical weathering process in which sheets of rock are fractured and detached from an outcrop.

Exobiology: The study of life outside the Earth.