Track quiz
Show on a big screenHere is the whole track on one screen.
| Idea | The rule |
|---|---|
| One thing arrives | Sunlight's energy is intensity × area × time. This holds while the intensity stays steady. |
| What arrives and what leaves | The ground absorbs sunlight and sends out heat. Greenhouse gases hold part of that heat back. |
| Not all the same light | Ultraviolet can harm, and ozone absorbs most of it. Visible light feeds plants. Infrared carries much of the Sun's heat. |
| Heated unevenly | A slanted beam spreads over more ground. Snow reflects most of the sunlight that lands. |
| Matter goes round | Water evaporates, condenses, falls, then flows on. The Sun drives this round. |
| Life is in the loop | Carbon goes round between air, living things and fuels. Life moves it fast. Fuels hold it for millions of years. |
| One system | Earth's five spheres affect one another. A change in one can reach the others. |
The sky is clear, and insolation is 1 kW per m². A 3 m² roof gets it for 2 hours. How much energy is that?
Which needs a material to travel through?
How does the air help keep Earth warm?
Which kind of sunlight is mostly absorbed by the ozone layer?
Why are the poles colder than the equator?
Which surface has the highest albedo?
Water seeps down into the soil. What is this called?
Which carbon step is part of the fast cycle?
Mud from a hill washes into a lake. Which two spheres are these?
Chapter 13 of your book is called Earth as a System. Read it this week.
Reveal every answer to finish this lesson.
That is the end of this subject for Class 9
Nicely done. There is more waiting at this same level — pick whichever you like.