Fuel cells convert chemical energy to electrical energy. True?All people in poor countries have easy access to boiled water. False?Pathogens are the only source of danger in water that is not possible. True?There is more gold in the oceans than locked in all the gold mines on Earth's surface. False?Because it contains carbon impurities, steel is stronger than iron. True?I'm not sure if all of these are correct. :(Thanks in advance!
Fuel cells - True Boiled water - False Pathogens - False Pathogens are micro-organisms that can cause disease. Pathogens of particular concern include bacteria, viruses and protozoa. Many of the pathogens that can be spread through drinking water are also spread through other means, including direct contact with people who are sick, contact with animals, contaminated food, and swimming in contaminated pools. Gold - True Even at the conservative estimates of 10 ppt of gold in seawater, there is a great deal of gold in solution in the oceans. Humankind has unearthed perhaps a total of 3.3 billion ounces of gold over the course of history, an amount equivalent To a cube of gold 55 feet on a side (Dworetzky 1988), but the sea water of the Earth's oceans contain about 25 billion ounces of gold (Burk 1989). Steel - True
