In their view, the colonists spread as far south as today's New York City, fishing, tending farm animals and cutting timber for seceral hundred years under the solicitous eye of the Catholic Church in Rome. That is a question that scientists now hope to be able to answer. Background Scientists drill Antarctic ice for information on climate changes 35 scientists from Norwegian Polar Institute arrived Wednesday in Antarctica, where they are going to drill into the icecap. The purpose of the scientific expedition is to determine how much of the global warming is caused by Man and how much climate change is caused by natural processes. The scientific programme is sponsored by EU and will be compared to similar measurements from Greenland, says Gunn Sissel Jaklin from Norwegian Polar Institute.
Scientists agree that varying temperatures is what makes each flake unique.
But most snow crystals begin with a similar design, a hexagonal prism made up of water molecules, usually clustered around a speck of dust. And each snow crystal changes its structure several times as it drifts down toward us. When sticking together the crystals are visible as snow clumps. Background Antarctic ozone hole closes for the year Antarctica's annual ozone hole has closed for the year, but scientists know it will be back next year. The ozone hole is not really a hole, but is a thinning layer of ozone.