Here is a question about this article: The production for sulfidic zinc ores produces large amounts of sulfur dioxide and cadmium vapor. Smelter slag and other residues of process also contain significant amounts of heavy metals. About 1.1 million tonnes of metallic zinc and 130 thousand tonnes of lead were mined and smelted in the Belgian towns of La Calamine and Plombieres between 1806 and 1882. The dumps of the past mining operations leach significant amounts of zinc and cadmium, and, as a result, the sediments of the Geul River contain significant amounts of heavy metals. About two thousand years ago emissions of zinc from mining and smelting totaled 10 thousand tonnes a year. After increasing 10-fold from 1850, zinc emissions peaked at 3.4 million tonnes per year in the 1980s and declined to 2.7 million tonnes in the 1990s, although a 2005 study of the Arctic troposphere found that the concentrations there did not reflect the decline. Anthropogenic and natural emissions occur at a ratio of 20 to 1.
What is the answer to this question: Why does the Geul River contain heavy metals in a significant amount?
****
So... mining operations leach significant amounts of zinc and cadmium

Here is a question about this article: The Anglo-Saxons formed a new, larger, settlement across the Itchen centred on what is now the St Mary's area of the city. The settlement was known as Hamwic, which evolved into Hamtun and then Hampton. Archaeological excavations of this site have uncovered one of the best collections of Saxon artefacts in Europe. It is from this town that the county of Hampshire gets its name.
What is the answer to this question: What people established a settlement in what is now the St. Mary's area of Southampton?
****
So... Anglo-Saxons

Here is a question about this article: Nevertheless, the government was able to make wide-ranging economic reforms that paid off in dramatically lower inflation and steady growth. The 1994 cease-fire in the Nagorno-Karabakh conflict has also helped the economy. Armenia has had strong economic growth since 1995, building on the turnaround that began the previous year, and inflation has been negligible for the past several years. New sectors, such as precious-stone processing and jewellery making, information and communication technology, and even tourism are beginning to supplement more traditional sectors of the economy, such as agriculture.
What is the answer to this question: Since when has Armenia experienced a positive growth in their economy?
****
So...
1995