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Exhaust gases are generated from the combustion chamber after the air-fuel mixture is burnt through the Power Stroke. These exhaust gases are "thrown out" in the combustion chamber through the Exhaust Stroke. The exhaust gases, including NOx, move through the Exhaust Valve, the Exhaust Passages and finally towards the atmosphere over the Exhaust System. Balsa wood can be a lightweight wood variety taken from trees of the name that hail from your rainforests of Central America, South America, plus some other regions. The warm and humid conditions in these areas are fantastic for the development of this plant. Balsa trees grow very rapidly - it usually takes only a decade for any tree being mature enough for cutting. However, once past the ten-year marker, an unharvested tree would harden on the exterior and rot inside, making this a useless piece. Recently, plenty of countries are facing the lake crisis, due to destructive drought. Yunnan province, the southwest section of China, is visited from the worst drought in 60 years. Nearly 8000 acres are badly affected with the drought, and ten million folks are struggling with water shortage. The same thing is usually to India. According to Lianhezaobao of Singapore on March 12, India is encountered the crisis of water shortage with the rapid population growth, economic development and increasing requirement for agricultural water.