(a) radon (b) mercury (c) lead (d) copper (e) iron 1. was once widely used in the united states as a gasoline additive 2. a gaseous decay product of uranium that is found in rocks 3. a leading cause of lung cancer in the united states 4. poses a health risk to humans who eat large quantities of marine fish such a

Answers

1. Lead was once widely used in the United States as a gasoline additive but it was banned due to health risk.

2. Radon is a radioactive gaseous decay product of uranium that is found in rocks, soil and water.

3. Radon is a leading cause of lung cancer in the United States because the by-product of this can get trapped in the lungs.

4. Mercury poses a health risk to humans who eat large quantities of marine fish such a tuna and swordfish.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?