Earth's Interior Composition and Magma Generation

•

The interior of the

Earth is

hot

 due to

decay of radioactive

minerals and residual

heat from Earth’s

formation

•

Crust and mantle are

solid rock

not liquid

Mantle

(Soild)

Crust

(Soild)

Outer

core

(liquid)

Inner

core

(soild)

•

Lithosphere

 – the rigid outer

part of the Earth made from

the crust and upper parts of

the mantle which mechanically

acts as a single unit. The

lithosphere is brittle and

cannot flow.

•

Asthenosphere

 – the upper

mantle below the lithosphere

which is ductile and can flow

plastically – but is still a solid.

Average section

of crust and

mantle (i.e. away

from plate

boundaries)

No magma

generated

1. Mid ocean

ridge

Magma

generated

2. Hotspot

Magma

generated

3. Subduction

zone

Magma

generated

a)

b)

c)

d)

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The Earth's interior comprises the lithosphere, asthenosphere, outer core, and inner core, heated by radioactive decay and residual heat. The lithosphere is rigid, while the asthenosphere beneath can flow plastically. Magma is generated at mid-ocean ridges, hotspots, and subduction zones, where plate boundaries interact. Away from plate boundaries, no magma is generated.

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Lithosphere Asthenosphere The interior of the Earth is hot due to decay of radioactive minerals and residual heat from Earth s formation Outer core (liquid) Inner core (soild) Crust and mantle are solid rock not liquid

Lithosphere the rigid outer part of the Earth made from the crust and upper parts of the mantle which mechanically acts as a single unit. The lithosphere is brittle and cannot flow. Asthenosphere the upper mantle below the lithosphere which is ductile and can flow plastically but is still a solid.