While there is no doubt that global temperatures are increasing, it is
A) now becoming clear that human activity is indeed a major contributor to global warming
B) now becoming clear that this effect is due to the slow brightening of the Sun
C) now certain that human activity has no effect on the Earth's climate
D) still not clear whether human activity is affecting the climate at all
A
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As of the time of the publication of the textbook, how many planet candidates have been discovered using the transit method?
A) a few thousand B) tens of thousands C) a few hundred D) about 10
At a point 10 m away from a long straight thin wire, the magnetic field due to the wire is 0.10 mT. What current flows through the wire? (?0 = 4? × 10-7 T ? m/
A)
Jupiter is more massive than all the other planets put together.
Answer the following statement true (T) or false (F)
A characteristic of shield volcanoes is the formation of a crater at the summit which occurs when:
A) the volcano erupts explosively. B) the lava withdraws and the surface collapses. C) the lava flows melt through the thin crust of the peak. D) the underlying hot spot suddenly turns on. E) the volcano is impacted by a large meteorite.