Question

Define in short (with respect to Earth):1. Crust 2. Mantle 3. Core .4. Biosphere 5. Asthenosphere
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Answer 1

Answer:

The internal structure of Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.

Answer 2

Crust:

• Upper most/ Outer most solid part
• Thinnest of all layers
• Oceanic crust is thinner & younger as compared to the continental crust
• Silicate matter + Aluminium (SIAL)

Mantle:

• Extends from Moho's discontinuity to a depth of 2900 km
• Moho's discontinuity: Boundary between the Earth's crust and mantle
• SIMA (Silica + Magnesium)
• Upper mantle & lower mantle
• Includes Asthenosphere

Asthenosphere:

• Upper portion of the mantle, extends up to 400 km
• Astheno means weak
• Main source of magma

Core:

• Gutenberg discontinuity: Between mantle & core
• Outer core is in liquid state and inner core is in solid state
• Mostly constituted by Nickel, iron (NIFE layer)
• V.high temperature & pressure
• Outer core & inner core

Biosphere:

• Biosphere is that sweet spot where atmosphere, lithosphere and hydrosphere interact and give rise to life