If left in isolation, a white dwarf will eventually
A. form a brown dwarf.
B. become the seed for a new star.
C. explode as a type la supernova.
D. cool off and become a black dwarf.
Answer: D
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Chemical disequilibrium inevitably exists near deep-sea volcanic vents, because
A) there are unequal concentrations of minerals and water B) the high-temperature vent water causes water molecules to break down into hydrogen and oxygen C) mixing between the high-temperature vent water and the surrounding low-temperature ocean water creates conditions in which minerals and water will undergo chemical reactions D) the high pressures existing at the ocean floor cause chemical reactions between minerals and water
A magnifying glass can be made from a diverging lens
Indicate whether the statement is true or false
Which jovian planets in our solar system have rings?
A) Saturn only B) Jupiter and Saturn only C) all but Neptune D) all four of the jovian planets have rings.
When oxygen and hydrogen gases combine, the result is
A) water. B) methane. C) a noble gas.