Geology 1 – Flashcards
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The currently accepted age of the Earth is ________ years.
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4.6 billion
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A ________ is a well-tested and widely accepted view that best explains certain scientific observations.
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theory
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T or F: A scientific theory is a tentative or untested explanation that is proposed to explain scientific observations.
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False
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The ________ refers to the sum total of all life on Earth.
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biosphere
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In which "sphere" would you find groundwater?
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hydrosphere
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According to the nebular hypothesis, all of the bodies in the universe evolved from a rotating cloud of gases and dust about 5 billion years ago.
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False
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Which of the following describes the inner planets of our solar system?
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They contain mostly iron, nickel, and rock-forming minerals.
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The ________ forms the relatively cool, brittle plates of plate tectonics.
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lithosphere
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The asthenosphere is actually a part of the ________ of the Earth.
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mantle
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The ________ is the thinnest layer of the Earth.
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crust
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T or F: The lithosphere, asthenosphere, and mesosphere are all layers of Earth defined by their composition.
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False
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The ________ is thought to be a liquid, metallic region in the Earth's interior.
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outer core
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Which of the following layers of Earth generates the magnetic field?
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outer core
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The most prominent feature on the ocean floor are the ________.
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oceanic ridges
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Which of the following describes the region of the ocean known as the mid-ocean ridge?
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a continuous elevated belt that winds underwater for more than 43,000 miles around the Earth
