Class 9  ·  Physics Olympiads  ·  ALLEN

Earth as a System
Energy, Matter & Life

Eight chapters. Thirty questions. One complete interactive guide to understanding how our planet works — built for Aayush.

8 Chapters
30 Questions
0 Completed
Overall progress
0 Correct
0 Answered
— Accuracy
Chapters
01 / 08 🌐
Earth's Five Spheres
Geosphere, hydrosphere, cryosphere, atmosphere, and biosphere — and how they interact.
5 questions →
02 / 08 ☀️
Solar Radiation
The electromagnetic spectrum, albedo, and how the Sun's energy reaches and heats Earth.
5 questions →
03 / 08 📐
Insolation & Calculations
The formula E = I × A × t, the solar constant, and worked numerical problems.
5 questions →
04 / 08 🌫️
Earth's Atmosphere
Five atmospheric layers, the ozone layer, greenhouse effect, and K.R. Ramanathan's work.
5 questions →
05 / 08 🌬️
Winds & Ocean Currents
Valley and mountain breezes, global pressure belts, gyres, and the North Atlantic Drift.
5 questions →
06 / 08 💧
The Water Cycle
Evaporation, condensation, precipitation, and how climate change is altering the cycle.
4 questions →
07 / 08 ♻️
The Carbon Cycle
Fast and slow cycles, the Keeling Curve, fossil fuels, and the greenhouse effect.
5 questions →
08 / 08 🧬
Nitrogen & Oxygen Cycles
Nitrogen fixation, nitrification, denitrification, Haber-Bosch, and global agreements.
5 questions →