In a cooling magma, which minerals are the first to crystallize?
What will be an ideal response?
Answer: Minerals with high melting point and low silica content are the first to crystallize.
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Two masses are suspended by cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 5.0 kg and the other mass,
has a mass of 3.0 kg. The acceleration of 
is
A. 3.3 
upward.
B. 3.3 upward.
C. 2.5 upward.
D. 2.5 upward.
E. 1.1 upward.
Solar radiation consists of waves principally in the
A) ultraviolet, visible short-wavelength range. B) long-wavelength infrared range. C) long wavelengths that cannot escape the Earth's atmosphere. D) short wavelengths that cannot escape the Earth's atmosphere.
In western movies you often see a person putting his ear against the rails in the train tracks to find out if a train is approaching
Why would this give him advance knowledge of the approach of a train?
Why was the Shoemaker-Levy 9 impact so important to astronomers?
A) It dredged up material that gave us our first direct look at Jupiter's interior composition. B) It confirmed our theory of solar system formation. C) It wiped out the dinosaurs. D) It was the first direct proof that impacts really occur. E) It was the first event in modern history that was brighter than the full moon in the sky.