Transfer of heat in the Earth's mantle is dominated by

A) radiation
B) seismic waves
C) convection
D) conduction


C

Physics & Space Science

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A proposed explanation for gamma-ray bursters is:

A) hypernova-making black holes and bi-polar jets. B) coalescence of a neutron star binary. C) collisions between two white dwarfs. D) Both A and B are possible. E) All three are possible.

Physics & Space Science

The most distant stars we can measure stellar parallax for are approximately

A) 50 parsecs away. B) 500 parsecs away. C) 5,000 parsecs away. D) halfway across the Milky Way Galaxy. E) in the Andromeda Galaxy.

Physics & Space Science

A super train is moving along a track at a speed close to the speed of light. You are watching the train from the ground. You observe lightning to strike in two places along the track, a mile apart, at precisely the same time. What would someone on the train say?

A) The two bolts of lightning struck at different times, and they struck at places that are less than a mile apart. B) The two bolts of lightning struck at different times, and they struck at places that are more than a mile apart. C) The two bolts of lightning struck at the same time, and they struck at places that are less than a mile apart. D) The two bolts of lightning struck at different times, and they struck at places that are precisely a mile apart.

Physics & Space Science