CBSE/NCERT/Notes/Class_08_Science
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Detailed notes on NCERT Class 8 Science Chapter 13
Earth is the only planet in the known universe where life is known to exist and thrive. Several unique conditions make this possible:
The Goldilocks Logic Just like the porridge in the fairy tale, the 'Goldilocks Zone' is a region around a star where it is 'not too hot' and 'not too cold' for liquid water to exist on a planet's surface—a fundamental requirement for life as we know it.
Life is supported by the interaction of four major "spheres":
Reproduction is the process by which living organisms produce offspring like themselves, ensuring that life continues even after the death of individuals.
Human actions are disrupting the Earth's delicate balance through three major challenges:
International agreements like the Montreal Protocol (for ozone) and the Paris Agreement (for climate) are steps toward protection. However, individual actions like reducing waste, reusing materials, and adopting sustainable farming are essential to keep Earth healthy.
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