Document · CBSE
Reading Material
divided into three types:
This is a document published by Central Board of Secondary Education on its own website. The summary below is taken from the document itself; the full original is linked at the foot of this page.
Open the official PDF on cbseacademic.nic.in
What the notice says
Adapted from NCERT textbook of Class XI 2022-23 edition.
The earth is composed of various kinds of elements. These elements are in solid form in the outer layer of the earth and in hot and molten form in the interior.
About 98 per cent of the total crust of the earth is composed of eight elements like oxygen, silicon, aluminium, iron, calcium, sodium, potassium and magnesium (Table 5.1), and the rest is constituted by titanium, hydrogen, phosphorous, manganese, sulphur, carbon, nickel and other elements.
Table 5.1 : The Major Elements of the Earth’s Crust
Extracted from the authority’s own document. It is reproduced in part, as evidence for what this page reports, and the complete notice remains on cbseacademic.nic.in.
Original document
- Published by
- Central Board of Secondary Education
- File
- https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart2/Geography_SecP2_2026-27_RM.pdf
- First recorded
Copyright in this document belongs to Central Board of Secondary Education. We link to it rather than hosting a copy.