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Layers of the Earth

📑 5 slides 👁 17 views 📅 2/11/2026
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Introduction to Earth's Layers

The Earth is composed of several distinct layers, each with unique properties.

Introduction to Earth's Layers
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The Earth's Crust

  • The crust is the outermost layer, ranging from 5-70 km in thickness.
  • It consists of continental crust (granite) and oceanic crust (basalt).
  • The crust is where all terrestrial life and geological activity occur.
The Earth's Crust
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The Mantle

  • The mantle lies beneath the crust, extending about 2,900 km deep.
  • It is composed of silicate rocks rich in iron and magnesium.
  • Convection currents in the mantle drive plate tectonics.
The Mantle
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The Core: Outer & Inner

  • The outer core is liquid, composed of iron and nickel, and generates Earth's magnetic field.
  • The inner core is solid due to extreme pressure, despite temperatures over 5,000°C.
  • Together, they are about 3,470 km in radius.
The Core: Outer & Inner
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Summary & Importance

  • Earth's layers influence surface geology, climate, and magnetic field.
  • Studying these layers aids in predicting natural disasters and resource exploration.
  • Each layer plays a critical role in making Earth habitable.
Summary & Importance
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