On the basis of the distribution of the elements in Earth's...

On the basis of the distribution of the elements in Earth's layers (see Figure $3.3),$ which of the following substances should be the most dense? (a) $\mathrm{SiO}_{2}(s) ;$ (b) $\mathrm{Al}_{2} \mathrm{O}_{3}(s) ;$ (c) $\mathrm{Fe}(\ell)$.

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Key Concepts

Material Composition and Comparison

Different substances have intrinsic differences in composition and structure that affect their density. Metals like iron have a high density due to their atomic structure and closely packed atoms, while silicate compounds, such as SiO2 and Al2O3, have lower densities because of their lighter constituent atoms and molecular arrangements. Comparing these substances helps in predicting their behavior in geological processes based on density.

Earth's Differentiation

Earth’s differentiation refers to the process during planetary formation where materials separated based on their density. Lighter silicate rocks formed the crust and mantle, whereas heavier elements, such as metals like iron, sank to form the core. This process explains why the core, which contains dense materials, lies at the center of the Earth.

Density

Density is the mass per unit volume of a substance, which determines how materials behave under the force of gravity. In the context of Earth’s structure, materials with higher density tend to sink toward the center while less dense materials remain closer to the surface. This concept is crucial for understanding the distribution of elements in different Earth layers.

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