[...]... much of it Structure of the Earth We live, and the dinosaurs lived, in a world that is constantly changing The surface of the land is continually being worn away by the action of the rain, rivers, The mantle forms the largest portion of the Earth Movements in the mantle, in which molten rock material rises glaciers, wind, and all other kinds of natural and spreads out and cool processes Over millions of. .. for the movement of the Earth' s outer layers The top layer dumped on plains and in oceans There they is called the crust It is the form rocks, which can be folded up into new Earth' s skin mountains and added to the continents Not only that, but the very structure of the continents is changing And the continents are slowly moving about over the surface of the Earth Our planet consists of a number of. .. amphibians, of which present-day frogs and toads are examples From these, the reptiles evolved The period of time between 245 and 65 million years ago is known as the Age of Reptiles Within this period was the time of dinosaurs When the big reptiles vanished, the marked by the kinds of animals that existed at that time, and hence on the fossils that we find in the rocks laid down then The dinosaurs lived in the. .. to their offspring or children Then the whole support them machinery of evolution would have been set in motion Evolution is a process by which V The evolution of, or the present day, Each changes to, the surface of level of the folded band new kinds, or species, of living things develop the Earth, from the time it covers a little more than 1,000 million years, from others started to cool until These... particular sea, now called the Supdance Sea, spread southward over the continent of North America It cut off the new Rocky Mountains to the west from the main part of the continent to the east Sand and pebbles spread out into the sea from the foot of the mountains and formed a broad river plain In spite of the nearby sea, this plain was quite dry \l Plant-eating dinosaurs, meat-eating dinosaurs, and pterosaurs... at the same time as in the rocks dinosaurs, including the two-footed plant-eaters, the plated dinosaurs, the dinosaurs geography the study of the the armored dinosaurs, and the amphibians animals such as frogs, ap pearance, formation, and changes horned dinosaurs toads, newts, and salamanders, to the land, sea, and air on Earth which lay their eggs and live as A major branch of geogra phy is ornithopod... The dinosaurs and many other creatures died The pterosaurs, the flyil].g reptiles, were out suddenly about 65 million years ago, a replaced by winged mammals, the bats The time that marks the end of the Cretaceous ichthyosaurs were eventually replaced by Period We do not know why this happened swimming mammals, the whales The Possibly the moving continents changed the different types of dinosaurs- the. .. tree-living mammals In the Eocene forests lived huge rhinoceros-like like climbing Plesiadapis and Chriacus, and gliding Uintatherium, the little rhinoceros Hyrachyus, and Planetotherium the tiny earliest horse Hyracotherium The Age of Humans The dinosaurs dominated the Earth for long ages Today human beings do All the known history of human beings is measured in thousands of years The emergence of human beings-unique,... 65-52 mya During the Tertiary Period, the Age of Mammals, the continents were drifting toward the positions in which they find themselves today Crust-solid Modern times Today's pattern of continents is temporary The continents are still drifting, and in times to come the world map will be different again North America Africa Australia Plates of the crust Each of the surface plates of the Earth grows along... l � , ; I! '\ ' In 'the Late Triassic Period, the first - I the Age of Dinosaurs, the desert conditions : still existed over much of our planet All the I continents of the world were jammed ' together to make up one huge landmass, calles! Pangaea This supercontinent was so big that most of it was a long way from the moist winds of the sea, and so hot dry conditions were common The earlier Permian .       Giants of the Earth     