EARTHSC 2GG3 Quiz: Quizzes
25 Dec 2015
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Heat within the earth comes from___: residual heat from asteroid impacts residual heat from gravitational pull to planet center (= gravitational contraction, decay of radioactive elements, all answers are right. What does the oceanic lithosphere consist of: basalt on top gabbro, followed by peridotite. When is a large event such as a major earthquake not a disaster? when it happens in an area without any people. Which of the following is true: earth"s crust is less dense than the mantle. Where do asteroids originate in space: they originate in a belt between mars and jupiter. How is the tail of a comet oriented? (which way does it point?: points away from the sun. How fast do comets travel in space: about 60 km per second. Question options: iridium anomaly, high radioactivity in the crater, impact melts rock and molten droplets spray outward (glass spherules, tsunami if impact in ocean. What are comets made of: ice and some rock.
