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media type="custom" key="4402549" media type="custom" key="4402571" Topic:media type="custom" key="4402619" Hi my name is Alice Tran and I go to Our Lady of the Rosary Primary School and this is a shout to all you e~tasc people out there I hope you enjoy the challenge day! media type="custom" key="4402629" The Challenge Day was awesome 41 students from Our Lady of the Rosary participated in this great event we had a great time and I can’t wait til next terms Challenge Day. media type="custom" key="4402653" media type="custom" key="4403083"

media type="custom" key="4402735" media type="custom" key="4402775" The Cambrian Period was the first known geological period of the Paleozoic era. The Cambrian was between 542 and 488 millions years ago. Back then the temperature was usually 21 degrees (7 degrees above the modern level).  The Period was established by Adam Sedgwick, who named it after Cambria, the classical name for Wales, where Britain’s Cambrian rocks are exposed. media type="custom" key="4404351" The Ordovician Period is a geologic period and system it is the second period of six in the Paleozoic Era. The Ordovician Period was between 488 and 443million years ago.At that time the temperature was 16 degrees ( 2 degrees above the modern level).The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879, to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison , who were placing the same rock beds in northern Wales into the Cambrian and Silurian periods respectively. media type="custom" key="4403277" The Silurian time period extend from the end of the Ordovician period and to the beginning of the Devonian period (443 to 416 millions years ago). Back then 60% of marine lives were wiped out. The temperature was 17 degrees (3 degrees above average level). media type="custom" key="4404293" The Devonian period was between 416 to 359 million years ago. It was named after Devon England, where rocks from this period were first studied. During this time the first fish evolved legs and started to walk on land. media type="custom" key="4404323" The Carboniferous was the second last period of the Paleozoic Era that extends from the end of the Devonian period and the beginning of the Permian period. The name comes from the Latin word for coal, //carbo//. Carboniferous means "coal-bearing." Many beds of coal were laid down all over the world during this period, hence the name. media type="custom" key="4404329" The Permian period was between 299 and 251 million years ago this is the last period of the Paleozoic Era, and was famous for its ending of the epoch event the largest mass extinction known to science. The Permian period was named after the kingdom of Permia in modern-day Russia by Scottish geologist Roderick Murchison in 1841. media type="custom" key="4404405" media type="custom" key="4404385" The Triassic period was the beginning of the The Mesozoic Era and extended from about 251 to 199 million years ago this was the beginning of Dinosaurs. media type="custom" key="4404393" The Jurassic period was between 199 and 145 million years ago and did you know that the Mesozoic Era was also known as the “Age of the Reptiles”. media type="custom" key="4404401"