Earth's interior structure investigation requires indirect means for study and seismic investigation (study of seismic waves) is a good way for investigation.
Introduction
22 words
Main Body
Seismic investigation → understanding of earth's interior structure. The diagram shows two hemispheres representing P-wave and S-wave shadow zones at different angles (45°, 105°). Shadow zone refers to region in the earth's surface where seismic waves are not [illegible]. Key points include: Shadow zone → region in the earth's surface where seismic waves are not repeated.
— Nidhi Goyal · AIR 91
Diagram
Two hemispheres showing P-wave shadow zone and S-wave shadow zone with angles marked at 45°, 105°, and 120°. Illustrates how seismic waves behave differently in the earth's interior layers.
- Clear diagram showing wave behavior
- Introduction of shadow zone concept
- Recognition of indirect investigation methods
Nidhi Goyal
Salient features of World's Physical Geography
Earth's Interior Structure
Seismic investigation and shadow zones
78
Total words
1
Paragraphs
Technical and descriptive
Tone