French hydrangea flowers for 5 to 9 weeks in late spring or early summer. The mophead or lacecap flowers develop from buds formed in the tips of stems the previous year (on old wood). Most older cultivars bloom just once.
Scientists discovered, and have confirmed, that sulfur dioxide (SO2) and nitrogen oxides (NOx) are the primary causes of acid rain. In the US, About 2/3 of all SO2 and 1/4 of all NOx comes from electric power generation that relies on burning fossil fuels like coal.cid rain is a broad term used to describe several ways that acids fall out of the atmosphere. A more precise term is acid deposition, which has two parts: wet and dry.
Acid Rain. Acid rain is caused when acid gases rise into the sky and mix with the clouds, this causes the clouds âabsorbâ the acid gasses and when the clouds produce rain, it falls with a higher than normal level of acidity. Rain is naturally acidic, but acid gasses make it even more acidic.cid rain is a problem all over the world, when acid gases are released, they go up in the sky, and then they are carried by strong winds. Acid rain in Scandinavian countries is caused by air pollution in Britain and other countries of Europe. In the USA, winds blow the air pollution to certain areas in Canada.