Humans and the biosphere
Answers are for parents and teachers.
1
A family produces 3 kg of waste a day. How many kg in 20 days?
60
2
30 % of 150 million km² of land is forest. What is the forest area in million km²?
45
3
Give two examples each of renewable and non-renewable resources.
Renewable: forest, soil fertility; non-renewable: oil, coal.
4
What is the greenhouse effect and why is it growing stronger?
Gases trap heat; CO2 and methane are increasing due to fuel burning and deforestation.
5
Write three ways to reduce waste at home.
Sort, reuse and avoid unnecessary packaging.