The primary factor that makes magmas different from one another is
What will be an ideal response?
the amount of silica they contain
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The positron was first predicted by
A) Einstein. B) Planck. C) Elvis Presley. D) Dirac. E) Heisenberg.
Why will it be hard to determine the nature of Venus' interior?
A) No orbiter has been able to find the exact mass of Venus. B) No seismograph can last long enough at Venus' temperatures to pick up quakes. C) No photos have ever been returned from Venus' surface. D) The clouds prevent us from finding the exact diameter and volume of Venus. E) The magnetic field of Venus is much stronger than our own.
The electric field at point P due to a point charge Q a distance R away from P has magnitude E. In order to double the magnitude of the field at P, you could
A) double the distance to 2R. B) double the charge to 2Q. C) reduce the distance to R/2. D) reduce the distance to R/4. E) double the charge to 2Q and at the same time reduce the distance to R/2.
An object in motion with constant speed along a straight line can never have nonzero angular momentum
Indicate whether the statement is true or false