The document summarizes the composition and structure of the Earth's interior. It is composed of three main layers - the crust, mantle, and core. The crust is the outermost layer and exists in two types, oceanic and continental. The mantle is the thick middle layer, while the core is mostly iron and makes up a third of the Earth's mass. The layers are similar to an egg, with the crust as the shell, mantle as the egg white, and core as the yolk. The Earth also has 5 physical layers from the lithosphere to the inner core. Tectonic plates comprise the crust, which breaks into about 19 pieces that move atop the asthenosphere.

1. Inside the EarthInside the Earth
By:- Dr. Roopam Khare
(Department of Geology)(Department of Geology)
Ph.D., M.Sc., M.Phil., NET,
LL.B., PGDM (ISHE), FGARC, FIJFAR

2. Composition (What it is made of)
• Crust
• Mantle
• Core

3. The Crust
• Outer layer
• 5-100 km thick
• 2 types of crust
– Oceanic (very dense,
made of basalt)
– Continental (less
dense, made of
granite)

4. Oceanic and Continental Crust

5. The Mantle
• Middle layer
• Very thick layer

6. The Core
• Made mostly of iron
• 1/3 of the earth’s mass
• Very hot

7. Earth’s Layers
• How are the earth’s
layers similar to an
egg?
• Shell=crust
• Egg white=mantle
• Yolk=core

8. Physical Structure of the Earth
(5 Layers)
• Lithosphere- rigid outer layer (crust)
• Asthenosphere- solid rock that flows
slowly (like hot asphalt)
• Mesosphere- middle layer
• Outer Core- liquid layer
• Inner Core- solid, very dense

9. Tectonic PlatesTectonic Plates
• Earth’s crust is broken into about 19
pieces
• These plates move on top of the
asthenosphere

10. Thanks!Thanks!