EARTH SCIENCE
TECTONICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They would detect a physical change from solid rock to partly molten rock.
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They would detect a change in composition from iron-rich minerals to silica-rich minerals.
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They would detect a physical change from partly molten rock to solid rock.
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They would detect a change in composition from magnesium-rich minerals to oxygen-rich minerals.
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Detailed explanation-1: -If scientists could bore through Earth’s interior, what change would they most likely notice as they passed from the asthenosphere to the mesosphere? They would detect a physical change from solid rock to partly molten rock.
Detailed explanation-2: -What direct evidence do scientists have concerning the properties of the asthenosphere? Heat from volcanic lava comes from near the asthenosphere.
Detailed explanation-3: -The Earth can be divided up into sections or layers according to two criteria-chemical composition and physical properties. There are three chemical layers; the crust, the mantle and core and five recognised physical layers; the lithosphere, asthenosphere, mesosphere, outer core and inner core.
Detailed explanation-4: -Knowing how the waves behave as they move through different materials enables us to learn about the layers that make up the Earth. Seismic waves tell us that the Earth’s interior consists of a series of concentric shells, with a thin outer crust, a mantle, a liquid outer core, and a solid inner core.
Detailed explanation-5: -The asthenosphere is a part of the upper mantle just below the lithosphere that is involved in plate tectonic movement and isostatic adjustments. It is composed of peridotite, a rock containing mostly the minerals olivine and pyroxene.