- eccentricity
- the eccentricity of an ellipse (planetary orbit)
is the ratio of the distance between the focii
and the major axis. Equivalently the eccentricity
is (ra-rp)/(ra+rp) where ra is the apoapsis distance and
rp is the periapsis
distance.
- effusive eruption
- a relative quiet volcanic eruption which puts out
basaltic lava that moves at about the speed one
walks; the lava is fluid in nature; the eruptions
at the Kilauea volcano on the island of Hawaii
are effusive
- Einstein, Albert
1879-1955
- German-American physicist; developed the Special
and General Theories
of Relativity which along with Quantum
Mechanics is the foundation of modern physics.
- ellipse
- oval. That the orbits of the planets are
ellipses, not circles, was first discovered by
Johannes Kepler based
on the careful observations by Tycho Brahe.
- erg/sec
- = 1e-10 kilowatts.
- explosive eruption
- a dramatic volcanic eruption which throws debris
high into the air for hundreds of miles; lava is
low in silicate; can be very dangerous for people
near by; an example is Mount St. Helens in 1980
- exponential notation
- "1.23e4" means "1.23 times 10 to
the fourth power" or 12,300;
"5.67e-8" means "5.67 divided by
10 to the eighth power" or 0.0000000567.
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