height above sea level
It is difficult to breathe in higher altitudes; oxygen masks are highly recommend.
arcs
a bowlike curved line or object
As the hot-air balloon descended behind our house, it made a colorful arc right above the roof.
charged particles
a particle with an electric charge charged particles can be positive, negative, or neutral.
electrons
an extremely small piece of matter with a negative electrical charge
An element has the same number of protons as electrons.
emanating
to send forth
Factors affecting effective cooperation of the team members are perceptions emanating from the failure of past projects.
emits
to send out
Our broken television emits a rattling sound from the speakers.
flicker
to move quickly
We had to stop watching TV because there was too much flicker; we need to get the TV fixed.
gaseous
of, having the nature of, or in the form of, gas
Jupiter is a gaseous planet and has no solid surface.
gusts
a sudden, strong rush of air or wind
The 130 mile per hour gusts of wind destroyed the entire village.
hemisphere
half of a sphere, especially the Earth
The northern hemisphere lies on the north side of the equator.
horizon
the place in one's view where the earth's surface forms a line with the sky
As the ship sailed smoothly across the ocean, the people could see another ship over the horizon.
magnetic field
a region of space near an electric current in which a magnetic force acts on any other electric current magnetic fields surround electric currents, magnetic dipoles, and changing electric fields.
magnetic poles
the north and south poles of a magnet
Earth has two magnetic poles: north and south.
magnitude
size or dimension
The magnitude of the earthquake was unclear until all the debris was cleared away.
particles
one of the most simple parts of all matter, such as an electron, a proton or a neutron
The atom is the smallest indivisible particle of matter.
photon
a particle having energy but no mass or electric charge
The photon has no mass, and therefore, can travel at the speed of light.
radiates
to give forth or spread
She always has a positive disposition; she radiates happiness.
spectrum
the series of colored bands dispersed and arranged in the order of their respective wavelengths
In a rainbow we can see all the colors of the visible spectrum.
streaks
a line or long mark
What is in vogue these days is for teenagers to highlight their hair with different streaks of color.
wavelength
the distance from one point to the same point on the next sound or electromagnetic wave
Waves with a longer wavelength take longer to travel than shorter waves.
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