Sidereal day is defined as
a.
24 hours in a day
b.
the time for one complete revolution of the earth relative to the celestial reference
c.
the time between periods when the sun is at the exact same height in the sky, for example, noon
d.
24 hours at greenwich, england

Which of the following does not determine the type of magma to erupt from a volcano? a. temperature b. gas content c. viscosity d. silica content what kind of volcano forms from basaltic magma with low-viscosity and low-gas content? a. shield volcano b. stratovolcano c. composite-cone volcano d. cinder-cone volcano what is viscosity? a. a rising mass of mantle abnormally hot and / or wet b. a pool of magma beneath the overlying crust c. what causes a bend to occur in the rock layer d. a measure of a fluid's resistance to flow