Question
Earth's layers formed as result of differentiation. During differentiation, elements and compounds formed varied layers of minerals. Minerals with low densities tend to crystalize from magma at cooler temperatures; minerals with greater densities crystalize at higher temperatures. Think about the zones or layers of the Earth. We would expect the rocks in the upper mantle of the lithosphere to have a high proportion of
Responses
A finely crystallized, dense minerals.finely crystallized, dense minerals.
B heavier, denser minerals such as galena.heavier, denser minerals such as galena.
C less dense minerals that form rocks such as granite.less dense minerals that form rocks such as granite.
D minerals that contain heavy metals such as iron and nickel.
Responses
A finely crystallized, dense minerals.finely crystallized, dense minerals.
B heavier, denser minerals such as galena.heavier, denser minerals such as galena.
C less dense minerals that form rocks such as granite.less dense minerals that form rocks such as granite.
D minerals that contain heavy metals such as iron and nickel.
Answers
Answered by
GPT-4o mini
To determine the composition of the rocks in the upper mantle of the lithosphere, we need to understand the properties of the materials that make up this zone. The upper mantle is comprised mostly of silicate minerals, which are generally denser than those found in the continental crust but less dense than those in the lower mantle and core.
Therefore, the rocks in the upper mantle would primarily consist of minerals that are more dense than those commonly found in surface granitic rocks but not as dense as those found in the deeper Earth layers.
Given the options provided:
A. finely crystallized, dense minerals - This does not accurately represent the upper mantle composition as it implies excessively dense minerals.
B. heavier, denser minerals such as galena - Galena is a lead sulfide mineral and not representative of the predominant minerals in the upper mantle.
C. less dense minerals that form rocks such as granite - The upper mantle is not composed of granitic rocks; granite is characteristic of the continental crust, which is less dense than the upper mantle.
D. minerals that contain heavy metals such as iron and nickel - This option is the most appropriate because the upper mantle contains minerals rich in iron and magnesium, such as olivine and pyroxene, which are characterized by their relatively high density compared to the surface granitic rocks.
Thus, the correct answer would be:
**D. minerals that contain heavy metals such as iron and nickel.**
Therefore, the rocks in the upper mantle would primarily consist of minerals that are more dense than those commonly found in surface granitic rocks but not as dense as those found in the deeper Earth layers.
Given the options provided:
A. finely crystallized, dense minerals - This does not accurately represent the upper mantle composition as it implies excessively dense minerals.
B. heavier, denser minerals such as galena - Galena is a lead sulfide mineral and not representative of the predominant minerals in the upper mantle.
C. less dense minerals that form rocks such as granite - The upper mantle is not composed of granitic rocks; granite is characteristic of the continental crust, which is less dense than the upper mantle.
D. minerals that contain heavy metals such as iron and nickel - This option is the most appropriate because the upper mantle contains minerals rich in iron and magnesium, such as olivine and pyroxene, which are characterized by their relatively high density compared to the surface granitic rocks.
Thus, the correct answer would be:
**D. minerals that contain heavy metals such as iron and nickel.**
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