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Natural Resources (VI–VIII) — 25-Question Test
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Key Concepts — Quick Reference
This chapter
Air, Water & Soil — the core facts
| Composition of air | ~78% Nitrogen · ~21% Oxygen · ~1% others (CO₂, argon, water vapour) |
|---|---|
| Water cycle | Evaporation → Condensation → Precipitation (then collection/run-off) |
| Soil profile | Topsoil (humus-rich) → Subsoil → Parent rock; formed by weathering |
| Soil types | Sandy (big particles, drains fast) · Clayey (fine, holds water) · Loamy (best for crops) |
Energy & Conservation
| Renewable (inexhaustible) | Sun, wind, water, biomass — replenished naturally |
|---|---|
| Non-renewable (exhaustible) | Coal, petroleum, natural gas — fossil fuels, finite |
| Fossil fuels | Formed from dead plants/animals buried for millions of years |
| The 3 Rs | Reduce · Reuse · Recycle — the conservation mantra |