Out of the five common rock-forming minerals (silicates, carbonates, oxides, sulfides, and sulfates), which two form economically important ores?
What will be an ideal response?
Oxides and sulfides.
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How does a black hole form from a massive star?
A) During a supernova, if a star is massive enough for its gravity to overcome neutron degeneracy of the core, the core will be compressed until it becomes a black hole. B) Any star that is more massive than 8 solar masses will undergo a supernova explosion and leave behind a black-hole remnant. C) If enough mass is accreted by a white dwarf star so that it exceeds the 1.4-solar-mass limit, it will undergo a supernova explosion and leave behind a black-hole remnant. D) If enough mass is accreted by a neutron star, it will undergo a supernova explosion and leave behind a black-hole remnant. E) A black hole forms when two massive main-sequence stars collide.
Process of Science: Why is it important to understand the Sun in order to understand the Earth's radiation belts and space weather?
What will be an ideal response?
Most large galaxies in the universe are
A) elliptical. B) spiral or lenticular. C) irregular. D) abnormal.
A satellite circles planet Roton every 2.8 h in an orbit having a radius of 1.2 × 107 m. If the radius of Roton is 5.0 × 106 m, what is the magnitude of the free-fall acceleration on the surface of Roton?
A. 31 m/s2 B. 27 m/s2 C. 34 m/s2 D. 40 m/s2 E. 19 m/s2