The Earth for SamHistory of the earth from the earliest days to the time when man began to make records. Grades 5-8. |
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Page 75
... peat bogs , and peat bogs are made from fallen trees , branches , and even leaves . In order to have peat bogs , however , there must be a great deal of low marshy country ; you could never have a peat bog on top of a hill . Peat bogs ...
... peat bogs , and peat bogs are made from fallen trees , branches , and even leaves . In order to have peat bogs , however , there must be a great deal of low marshy country ; you could never have a peat bog on top of a hill . Peat bogs ...
Page 78
... peat bogs that has been baked in this way we call coal . Many times , after a peat bog had sunk , it was covered with enough mud to reach to the surface of the water . Then a new forest grew on this second swamp and there was formed an ...
... peat bogs that has been baked in this way we call coal . Many times , after a peat bog had sunk , it was covered with enough mud to reach to the surface of the water . Then a new forest grew on this second swamp and there was formed an ...
Page 135
... peat bogs were formed , which later became submerged and were baked into the coal that is found all the way from Canada to Arizona . In Colorado alone it is estimated that there are 34,000 mil- lion tons of the coal of the Cretaceous ...
... peat bogs were formed , which later became submerged and were baked into the coal that is found all the way from Canada to Arizona . In Colorado alone it is estimated that there are 34,000 mil- lion tons of the coal of the Cretaceous ...
Contents
When the Earth Was Hot | 3 |
The Air We Breathe | 9 |
Seaweed and Jellyfish | 13 |
Copyright | |
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ago and lasted American Museum amphibians ancestors animals appeared Archaeopteryx became began birds Bothriolepis bottom C. R. Knight called canyon Carboniferous Carboniferous Period chlorophyll clouds CO₂ coal Coast cold crack creodonts Cretaceous Cretaceous Period Cro-Magnon crust descendants developed Devonian dinosaurs earth Eocene Europe fauna feet Figure fishes flowed forests formed fossil giant glacier Greenland grew groups of cells horse huge ichthyosaurs inland seas insects Lake lava little particles mammals meat eaters melted rock million years ago Miocene mosasaurs Museum of Natural North America ocean Oligocene outer layer painting by C. R. peat bogs perhaps Permian Permian Period picture plants Pleistocene primates probably rain reptiles rivers rose salt scorpions seaweed sequoia shallow seas shellfish Sierra Nevada Silurian Silurian Period skin slowly Smilodon sometimes starfish streams thousands tiny trees Triassic Period Tyrannosaurus rex valley volcanoes warm wrinkles