Classic Newtonian reflector telescopes use a mirror shaped like ________
A) a convex spherical surface B) a concave spherical surface
C) a hyperbola D) a parabola
D
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How was salinity measured before the use of salinometers?
a. Silver nitrate was used to measure the chlorinity b. The mass of the salts were measured after water was evaporated c. The conversion of sodium levels to salinity based on equations d. Measure of conductivity
True or False: Meteorites are called meteoroids when they land on the surface
Indicate whether this statement is true or false.
Maps of the Difficulty: Global distribution of the mean height of the 500 mb surface in January and July demonstrate that all of the following is true, except:
A) 500 mb heights are greatest over the tropics. B) 500 mb heights typically increase with increasing latitude. C) the gradient in height is greatest in the hemisphere experiencing winter. D) for a given latitude the 500 mb height is greater in summer than in winter.
According to the Enhanced Fujita Scale, an ____ tornado causes only minimal damage, whereas an ____ completely demolishes a house and sweeps it off its foundation
a. EF0; EF3 b. EF1; EF5 c. EF0; EF5 d. EF1; EF4 e. EF2; EF3