The basic mechanism for plate movement is thought to be
a. earthquake surface waves.
b. the tidal force of the Moon.
c. convection cells in the asthenosphere.
d. earthquake body waves.
c
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The Earth is about ___________ years old by ___________
a. 4 billion years old: radioactive dating b. 4 million; measuring Earth's orbital period around the Sun c. 4 billion; measuring Earth's orbital period around the Sun d. 4 million; radioactive dating
In the figure, the radius of curvature of the curved part of the lens is 35.0 cm, and the refractive index of the lens material is 1.620. What is the focal length of the lens?
A) +56.5 cm B) -56.5 cm C) +28.2 cm D) +21.6 cm E) -21.6 cm
Parallels of latitude are parallel to the
a. longitude. b. International Date Line. c. equator. d. meridian.
Two singly ionized isotopes, X and Y, of the same element move with the same speed perpendicular to a uniform magnetic field. Isotope X follows a path of radius 3.35 cm while isotope Y moves along a path 3.43 cm in radius. What is the ratio of the two isotope masses, mY/mX?
a. 0.977 c. 1.05 b. 0.954 d. 1.02