This technical note focuses on heavy. metal soil contamination. Metals in Soil. Mining, manufacturing, and the use of synthetic products (e.g. pesticides, paints, batteries, industrial waste, and land application of industrial or domestic sludge) can result in heavy metal contamination of urban and agricultural soils.
As a beginner, try practicing the guitar for 10-15 minutes a day. As you begin to build your finger muscles and improve your playing, you can increase this amount of time as you see fit. You may feel comfortable practice for 30 minutes per day, an hour per day, or even more.
To learn the violin it can take anywhere from 3 or 4 years to 10 years, and then you never really stop learning, there's always something that can be improved. Have fun, and good luck! If there is anyone here whom I have not insulted, I beg his pardon.