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20 Cards in this Set
- Front
- Back
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If there is 7 billion people in 2010 and a growth rate of 1.2%/year, what will be the population in the year 2116? (use the rule of 70)
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28 billion
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Which description of radioactive isotopes would indicate the oldest rocks?
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much more daughter isotopes than parent isotopes
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During the final stage, of this process, the Earth was bombarded by asteroid and comets.
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ACCRETION
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What is true about the elements of the periodic table which we find on Earth?
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before Earth formed stars and supernovas created the larger elements from smaller ones.
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Which of the following 2 elements are the most abundant in the crust and mantle of the Earth?
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oxygen and silicon
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Which of the following would not have the highest or lowest specific gravity (density)?
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rocky asteroids
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Which of the following theories is most likely correct about the formation of the moon?
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it was formed by a major planetary collision
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The magnetic field of the Earth is mostly a result of...
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the dynamic molten outer core.
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Where on Earth would the magnetic field be oriented nearly parallel to the surface?
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near the equator
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What 20th century discovery convinced scientists that plate tectonics was a reality?
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detailed data on the shape and age of the ocean floor
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What best describes the magnetic anomalies oceanographers discovered in the 50’s?
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paleomagnetic patterns on the ocean floor resulting from sea floor spreading
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This squishy, partially molten, layer allows plates to slide on top of it.
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asthenosphere
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The process of subduction...
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destroys ocean crust at deep sea trenches
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What feature would be a general characteristic of an ocean spreading zone?
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rift valley
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Which of the following would not be similar in meaning to convergence?
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rifting
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The oldest oceanic crust is...
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found near oceanic trenches
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What process is directly related to the development of a continental collision zone?
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subduction along deep ocean trenches
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A curved chain of active volcanic islands would be called ____?
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an island arc
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Which of the following is not occurring along the San Andreas fault
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volcanism
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How long would it take to form 2400 kilometers of ocean crust at 8 centimeters per year
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30 million years
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