Which is the innermost layer of the Earth?

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Prepare for the CSET Multiple Subjects Subtest 2. Dive into math and science with flashcards and multiple choice questions, each question offering hints and explanations. Gear up for your success!

Multiple Choice

Which is the innermost layer of the Earth?

Explanation:
Earth's interior is layered, and the deepest zone is a solid sphere at the center. Surrounding it is a liquid layer, then a thick mantle, and finally the crust. The center stays solid because the immense pressure there keeps iron-nickel from melting, even though temperatures are extremely high. Seismic waves help reveal this structure: some waves cannot travel through liquids, showing the presence of the liquid outer layer, while the way waves slow and bend at boundaries indicates a distinct solid core inside. So the innermost layer is the solid inner core.

Earth's interior is layered, and the deepest zone is a solid sphere at the center. Surrounding it is a liquid layer, then a thick mantle, and finally the crust. The center stays solid because the immense pressure there keeps iron-nickel from melting, even though temperatures are extremely high. Seismic waves help reveal this structure: some waves cannot travel through liquids, showing the presence of the liquid outer layer, while the way waves slow and bend at boundaries indicates a distinct solid core inside. So the innermost layer is the solid inner core.

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