What two factors can change a rock's melting point?
What will be an ideal response?
Answer: Pressure and water. Inside Earth, pressure increases with depth as a result of the increased load of rock above. As pressure increases, melting point increases. The water content of a rock also affects its melting point. Rocks with a higher water content have a lower melting point. Rocks with a low water content have a higher melting point.
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When an ideal gas is subjected to an adiabatic process
A) no work is done on the gas. B) the temperature of the gas does not change. C) the internal energy of the gas does not change. D) all of the above E) none of the above
All planetary nebulae are slowly-expanding spherical disks ejected by red giants, while their exposed cores appear as white dwarfs
Indicate whether the statement is true or false
When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is
A) half. B) the same. C) twice. D) four times as much. E) none of the above
Given how many times intelligent civilizations could have appeared over the universe's history, it is most likely that if other civilizations exist, they will
A) be slightly less advanced than us B) be much less advanced than us C) have about the same level of technology as us D) be much more advanced than us