1Give the reason: coloured plastic is used on artificial greenhouses built to grow plants in cold regions.
2What is the greenhouse effect? State how the greenhouse effect is useful.
3Why does it feel warmer when the sky is cloudy than when the sky is clear?
4What is a greenhouse, and what materials is it built from?
5Which gases are the greenhouse gases, and why is their amount in the atmosphere rising?
6Write any five effects of the greenhouse effect.
7When a model greenhouse is kept in the sun, the temperature inside rises above the temperature outside. Explain why.
8Write the differences between an artificial greenhouse and the natural greenhouse.