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Difficulty: HardInternal and External Structure of the Earth

Match each Earth layer or structural boundary listed in Column A with its defining physical or compositional characteristic in Column B.

  • Conrad DiscontinuitySeismic boundary separating the sialic upper continental crust from the underlying simatic oceanic crust.
  • AsthenosphereDuctile, partially molten zone of the upper mantle that accommodates lithospheric plate movement.
  • StratosphereExternal atmospheric layer featuring temperature inversion due to solar ultraviolet absorption by ozone.
  • BarysphereInnermost structural zone of the Earth characterized by extreme density and rich iron-nickel composition.

Answer

Conrad Discontinuity matches the boundary between sial and sima crustal layers; Asthenosphere matches the ductile upper mantle zone; Stratosphere matches the atmospheric ozone heating zone; Barysphere matches the dense iron-nickel core.
Each feature correctly pairs its structural location with its chemical or physical attribute: the Conrad Discontinuity divides sialic and simatic crust, the Asthenosphere acts as the ductile upper mantle layer, the Stratosphere contains the protective ozone layer, and the Barysphere forms the dense central core region.

Step-by-Step Solution

1
Identify the internal boundary separating the upper continental crust from the lower crustal layer.
The Conrad discontinuity separates the granitic sial layer from the denser basaltic sima layer.
Geophysical observations show a distinct seismic velocity transition between continental sial and oceanic sima.
2
Analyze upper mantle rheology and thermal structure.
The asthenosphere is the weak, plastic layer of the upper mantle directly underlying the rigid lithosphere.
Partial melting allows convection currents to drag tectonic plates across the asthenosphere.
3
Examine thermal profile and chemical features of Earth's atmospheric envelope.
The stratosphere houses the ozone layer where ultraviolet radiation absorption leads to vertical temperature increases.
Solar UV absorption by O3 molecules converts radiant energy into heat within the atmospheric stratosphere.
4
Determine the compositional term for Earth's innermost structural core.
The barysphere represents the high-density interior metallic core consisting predominantly of nickel and iron (nife).
Gravitational and seismic data confirm the high-density metallic core situated at Earth's center.

Key Concept

Internal and External Structure of the Earth
Estimated Time:1m 30s
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Topics

Internal and External Structure of the Earth

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