If a magma contains molten forms of mineral A (30% silica) and mineral B (25% silica), which would crystallize last as the magma cools?
What will be an ideal response?
Answer: A
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Humans have existed on Earth for about _____
A) 4 million years B) 5 million years C) 6 million years D) 7 million years
The wavelength in air (temperature of 20°C) of a sound wave of frequency 0.50 kHz is
A) 0.68 m. B) 0.75 m. C) 2.0 m. D) 1.5 m. E) 1.8 m.
The Chandrasekhar limit is
A) the upper-mass limit for a white dwarf. B) the temperature at which hydrogen fusion starts. C) the point at which a planetary nebula forms. D) the temperature at which helium fusion starts. E) the lower-mass limit for a Type II supernova.
Imagine we've discovered a planet orbiting another star at 1 AU every 6 months. The planet has a moon that orbits the planet at the same distance as our Moon, but it takes 2 months. What can we infer about this planet?
A) It is more massive than Earth. B) It is less massive than Earth. C) It has the same mass as Earth. D) We cannot answer the question without knowing the mass of the star. E) We cannot answer the question without knowing the mass of the moon.