A blood transfusion is a safe, common procedure in which blood is given to you through an intravenous (IV) line in one of your blood vessels. Blood transfusions are done to replace blood lost during surgery or due to a serious injury. A transfusion also may be done if your body can't make blood properly because of an illness. During a blood transfusion, a small needle is used to insert an IV line into one of your blood vessels. Through this line, you receive healthy blood. The procedure usually takes 1 to 4 hours, depending on how much blood you need. Blood transfusions are very common.
1 The roots of the ancient mountain range that now lies at the bottom of the Grand Canyon were formed about 1.7 billion years ago. 2  There is then an unconformity of about 450 million year in which the rocks are missing. 3  At 1.25 billion years ago the first sedimentary layer, the Bass Formation, was laid down.
Learn where the Grand Canyon is located, how long it is, why it is an important site for geologists, how many visitors it has each year, how deep it is, when it became a national park and much more. The Grand Canyon is found in the US state of Arizona.Many people consider it to be one of the seven wonders of the natural world. The Grand Canyon is 277 miles (446 kilometres) in length. At its widest point the Grand Canyon stretches 18 miles (29 kilometres) across.At its narrowest point it stretches 4 miles (6.4 kilometres) across. The Grand Canyon is around 6000 (1800 metres) feet deep. The Colorado River runs through the Grand Canyon, it has been eroding its steep sides for millions of years.t its widest point the Grand Canyon stretches 18 miles (29 kilometres) across. At its narrowest point it stretches 4 miles (6.4 kilometres) across. The Grand Canyon is around 6000 (1800 metres) feet deep. The Colorado River runs through the Grand Canyon, it has been eroding its steep sides for millions of years.