Everything Everywhere Daily A Journey to the Center of the Earth
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May 6, 2025 Discover the incredible layers beneath our feet, extending 6,400 kilometers deep. Unravel the mysteries of the Earth's crust, mantle, and core, each with unique properties and compositions. Learn how scientists use seismic waves to peek inside the planet, revealing fascinating details about a liquid layer near the center. This exploration highlights the triumphs of science in understanding our planet's hidden depths.
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Seismic Waves Reveal Earth's Layers
- Seismic waves reveal the Earth's interior through changes in speed and direction across layers.
- S waves disappear in liquids, exposing the Earth's liquid outer core.
Earth's Crust Diversity
- The Earth's crust is thin, less than 1% of the volume, and varies between continental and oceanic types.
- Continental crust is thicker and less dense than younger, thinner oceanic crust.
Upper Mantle's Dual Nature
- The upper mantle consists of the rigid lithospheric mantle and the plastic asthenosphere below it.
- The asthenosphere allows tectonic plates to move by flowing slowly under heat and pressure.