Metal and Stone age Man
Process Metallurgy is one of the oldest sciences. Its history can be traced back to 6000 B.C. It is worthwhile to send a its little time to know the Initiation of man kinds association with Metals. Stone age man learned to fashion gold into jewellery and ornaments,learning that it could be formed into sheets and wirees easily. The use of Copper in Antiquity is of more significance than gold as the first tools ,implements and weapone were made from copper.
Threats To Biodiversity
An estimated 99 percent of all species that ever lived are extinct.Yet more kinds of creatures may be alive to day than at any other single time in the planet's 4.6 billion-years history. In the begining single-celled microbes had a watery, rocky world to themselves.During the Cambrain period, wich began 540 million years ago,complex animal life increased dramaticaly. And some disappeared. On at least five occasions in the past, mass extinctions destroyed whole familiesof species across the globe in relative short time periods.
At first light 70 milion years ago a SAUROLOPHUS nesting in Mongolia begins to stir .Like other billed-dinosaurs or hadrosaurs the SAUROLOPHUS likely laid her eggs at the same time and place as the rest of her herd. Too heavy to sit on the nest, she probably coverd it with vegetation, then tended her young once they hatched.
The Emergance of man in Africa
FOR CENTURIES MAN"S IMAGINATION has been captured by attempts, usually fanciful,to establish the exactlocality of the plase of origin of the humanrace-the pradise of ancient mythology. Scientific research of the last few decades, carried out by archeologists, paleontologist, and workers in allied disciplins, is making it increasingly likely that the continent, probably south of the Sahara.
As the 21st century approches, the news on global populatin in mixed. The fear decades past, that az exploding population would quicly outstrip Earth capacity to support it , has subsided.Falling birthrates have sloved population growth, and there's good ghance that te world's populatin will level off in the next century. But that will be with several billion more people, and planet poulatin --5,9 billion and growing by more tahn 90 million a year-- as almost doubed since 1960.