Unit 4 (Vocabulary Quiz)
Terms in this set (15)
a center line to which parts of a structure or body may be referred.
the degree of elongation of an elliptical orbit
an oval shape defined by points for which the sum of distances to two fixed points (foci) is a constant; a circle is an ellipse of zero eccentricity
the location within Earth along a fault at which the first motion of an earthquake occurs; one of the two central defining points of an ellipse
an action exerted on a body that tends to change the body's state of rest or motion; force has magnitude and direction
a force of attraction between objects that is due to their masses and that decreases as the distance between the objects increases
a gas composed if molecules that absorb and radiate infrared radiation.
the solar radiation (energy from the sun) that reaches Earth; the rate of delivery of solar radiation per unit of horizontal surface
a large cloud of gas and dust in an interstellar space; a region in space where stars form
the path of a body as it moves around another body due to their mutual gravitational attraction
the motion of the axis of a spinning body, such as a wobble of a spinning top, when there is an external force acting on the axis; a slow gyration of Earth's rotational axis relative to its orbit.
a disk of gas and dust particles that orbit a newly formed star, from which planets may form
a stream of high-speed, ionized particles ejected primarily from the sun's corona
a dark area of the photosphere of the sun that is cooler than the surrounding areas and that has a strong magnetic field
evaporating readily at normal temperatures and pressures; a substance that is volatile
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