Interior of the Earth — Chapter Summary
ICSE · Class 11 · Geography
Summary of Interior of the Earth for ICSE Class 11 Geography. Key concepts: Direct observation, The crust is the outermost and The mantle lies below.
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Overview
The Earth has a layered internal structure made of the crust, mantle, and core. Direct access to the deep interior is very limited because the deepest mine is only about 4 km deep and the deepest oil drilling hole is about 6 km deep, while the Earth's radius is 6,370 km. Knowledge of the interior th
Key Concepts
Direct observation of the Earth's interior
Direct observation of the Earth's interior is possible only for a very small upper part. Most knowledge comes from indirect sources such as density, t
The crust is the outermost solid
The crust is the outermost solid layer of the Earth. Its average thickness is about 33 km. It is thicker below mountains and thinner below oceans.
The mantle lies below the crust
The mantle lies below the crust and extends to a depth of 2,900 km. It is divided into the upper mantle and lower mantle. The upper mantle includes th
The core lies beyond 2
The core lies beyond 2,900 km and extends to the centre of the Earth. It has an outer core that is liquid and an inner core that is solid. The core ha
The average density of the Earth
The average density of the Earth is 5.5, but surface rocks are much lighter. Sedimentary rocks have an average density of 2.7, igneous rocks range fro
Learning Objectives
- Identify the main layers of the Earth and their characteristics.
- Explain how indirect evidence helps in studying the Earth's interior.
- Describe the behaviour of P-waves, S-waves, and L-waves.
- Understand the meaning of Moho discontinuity and Gutenberg discontinuity.
- Compare the crust, mantle, and core on the basis of depth, density, and physical state.
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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