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
... coal is made of atoms of C or carbon , and in Chapter 3 we learned how the chlorophyll in leaves kept the C it took from the CO2 . Our first great coal beds were made in the period that we are now going to talk about . It has ...
... coal is made of atoms of C or carbon , and in Chapter 3 we learned how the chlorophyll in leaves kept the C it took from the CO2 . Our first great coal beds were made in the period that we are now going to talk about . It has ...
Page 78
... coal . Of course when the peat was pressed and baked into coal , the layers of mud were , at the same time and for the same reason , turned into rock . Sometimes the land rose again sufficiently to bring these beds of coal near the ...
... coal . Of course when the peat was pressed and baked into coal , the layers of mud were , at the same time and for the same reason , turned into rock . Sometimes the land rose again sufficiently to bring these beds of coal near the ...
Page 135
... coal of the Cretaceous Period . Another thing that we use much as we do coal was made during this period . It is oil , called petroleum , from which gasoline and kerosene are made . When a little shellfish dies , tiny globules of oil ...
... coal of the Cretaceous Period . Another thing that we use much as we do coal was made during this period . It is oil , called petroleum , from which gasoline and kerosene are made . When a little shellfish dies , tiny globules of oil ...
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