2006-11-26 14:37:14 · 5 answers · asked by migotran 1 in Science & Mathematics ➔ Physics
Both are present in small amounts in soils and rocks. Spillage from waste dumps can be a source also.
2006-11-26 14:39:27 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Lead and Mercury get in water mainly by following 2 ways
- Leaching.- the Lead and Mercury present on soil ( including dumps , litter etc) gets dissolved in rain water due to the acid content finds its way either to ground water or to the water bodies .
- Direct pollution - Dumping of waste and untreated effulents on land and in rivers , sea .
2006-11-26 15:38:18 · answer #2 · answered by Vikkrant 2 · 0⤊ 0⤋
A large percentage of it is our failure to recycle - this is especially true in the past, but proper disposal techniques are slowly being implemented in towns and cities across the nation.
Batteries, thermostats, tilt switches, electronic appliances, plumbing fixtures and many other items contain lead and/or mercury. When they end up in a land fill, they eventually will end up in our ground water.
The run off from factories and manufacturing plants in the past is also being addressed more carefully now.
2006-11-26 15:16:16 · answer #3 · answered by LeAnne 7 · 0⤊ 0⤋
When people throw pencils and thermometers in the water systems
2006-11-26 15:23:08 · answer #4 · answered by az_ zoo 2 · 0⤊ 0⤋
1) runoff from mining operations
2) commercial sewage dumping from electronics manufacturing plants
3) runoff from residential areas where people dump old chemicals in the gutters.
2006-11-26 14:47:08 · answer #5 · answered by kate 7 · 0⤊ 0⤋