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💡 One connected planet
Life on the Earth runs on a constant flow of energy and matter. Sunlight, the hot interior and chemical reactions in air, water and rock all drive it — and everything is linked through five interacting ‘spheres’.
❓ Think It Over
- How does the warming of Arabian Sea water affect the southwest monsoon in India?
- If a large forest is cleared, how can that affect the flow of a river in that area?
- What might happen to coastal cities in India if glaciers and polar ice keep melting faster?
- How would increasing carbon dioxide levels in the atmosphere affect the ocean plankton?
What are the Earth’s five spheres?
- Geosphere — solid rocks, soil and landforms (Deccan plateau, Thar desert) and the Earth’s interior; Hydrosphere — liquid water (oceans, rivers like the Ganga–Brahmaputra, lakes, groundwater).
- Cryosphere — solid water as ice and snow (Himalayan glaciers, polar ice caps); Atmosphere — the air surrounding the Earth.
- Biosphere — all living organisms and their habitats. A disturbance in one sphere leads to changes in the others.
NCERT Question 13 — Suppose there is a rise
Suppose there is a rise in atmospheric temperature on Earth. How would this affect the cryosphere, hydrosphere and biosphere?
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NCERT Question 15 — Describe the interrelationship between different
Describe the interrelationship between different spheres of the Earth. Illustrate with example how these spheres function in a delicate balance.
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In this chapter we will learn about how the Sun heats the Earth unevenly, how that uneven heating drives winds and ocean currents, how matter moves through the water, carbon, nitrogen and oxygen cycles, and how human activities are disturbing these balanced processes across the Earth’s spheres.
Earth
A single connected planet whose spheres constantly exchange energy and matter.
as
We study the Earth as one whole, not as separate pieces.
a
Its rock, water, ice, air and life form a single unit.
System
These parts act together as one interacting system.
Energy
Sunlight is the main energy source, driving heating, winds and currents.
Matter
Water, carbon, nitrogen and oxygen cycle between the living and non-living world.
and
Energy and matter together connect every sphere of the Earth.
Life
The biosphere depends on a delicate balance that humans can easily disturb.
Topics We Will Study
In this Activity, we will explore how the different spheres of the Earth are interconnected.
- Observe the features of the Earth in Fig. 13.1 and circle one example of each sphere.
- Explain how snow (cryosphere) eventually becomes part of the lake (hydrosphere).
- Predict how a few years of less snowfall would affect the lake’s level and the grass for the sheep.
- Discuss and write how the spheres are interconnected and how a disturbance in one leads to changes in others.
What we observe
A disturbance in
one sphere leads to changes in others
— less snow means less lake water and less grass; warmer seas change the monsoon and melt glaciers.
