What are the conditions necessary for a terrestrial planet to have a strong magnetic field?
A) a molten metallic core only
B) fast rotation only
C) a rocky mantle only
D) both a molten metallic core and reasonably fast rotation
E) both a metal core and a rocky mantle
D
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Which planet is most similar in size and mass to Earth?
A) Mercury B) Venus C) Mars D) Jupiter E) Neptune
About 75% of the mass of the visible universe is composed of which element?
a. Helium b. Iron c. Hydrogen d. Silicon
The physical characteristic that is used to distinguish intrusive igneous rocks from extrusive igneous rocks is _____________
a. silica content b. hardness c. color d. grain size
The total electric flux through a closed cylindrical (length = 1.2 m, diameter = 0.20 m) surface is equal to -5.0 N × m2/C. Determine the net charge within the cylinder
a. -62 pC b. -53 pC c. -44 pC d. -71 pC e. -16 pC