The most valuable native element mineral is gold.

true
false

Any sound above what db can cause hearing loss in human beings

Match the pollutants. 1. a chlorofluorocarbon smoke 2. a biodegradable organophosphate insecticide freon 3. particle pollution paint 4. hazardous waste monoxide 5. carbon is completely burned malathion 6. carbon is incompletely burned dioxide

What is true of sea slugs in these orders