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The Earth, though seemingly solid and stable from the surface, is actually a complex structure composed of multiple layers, each with distinct physical and chemical properties. Geoscientists, through methods such as seismic wave analysis, magnetic field studies, and high-pressure laboratory experiments, have been able to infer the composition, density, and state of these layers. Broadly, the Earth is divided into three main layers: the crust, the mantle, and the core, each playing a crucial role in the dynamics of the planet. 1. Crust The crust is the outermost layer of the Earth, representing only a small fraction of its total volume and mass. Despite its thinness, it is the layer upon which all terrestrial life exists and human civilization thrives. The thickness of the crust varies considerably, ranging from about 5 to 10 kilometers beneath the oceans (oceanic crust) and 30 to 70 kilometers beneath continental regions (continental crust). The crust is composed mainly of silicate rocks, with continental crust rich in granitic rocks _____ _______ _____ ___ ______ _______ ___.
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