1. which element is not in PVC?
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Other questions in this quiz
2. which of these does salt not have to pure to use?
- Road grit (winter snow ice melting)
- flavouring food
- preserving food
- not sure
3. who thought of the plate tectonic theory?
- Alfred Wegner
- Nicholas le blanc
- Charles Darwin
- Albert Einstein
4. what is an enviromental impact of salt mining?
- needs wood as a fuel to heat it up (cutting down trees)
- can cause subsidence (buildings falling down)
- only works where its really sunny
5. Which methord of salt mining is used for road grit in the winter?
- Salt mining
- i dunno
- solution mining
- evaporating sea water