Children's Encyclopedia1976 |
Des de l'interior del llibre
Resultats 1 - 3 de 6.
Pàgina 14
... coal . The mud of the swamps turned slowly into solid rock . Coal is found in strips or seams . Miners dig it out as they are doing in the picture on the right . Men and machines rip out the coal . It is then taken in trucks to the main ...
... coal . The mud of the swamps turned slowly into solid rock . Coal is found in strips or seams . Miners dig it out as they are doing in the picture on the right . Men and machines rip out the coal . It is then taken in trucks to the main ...
Pàgina 15
... coal or oil power stations . But they are much cheaper to run . They do not need any fuel . As coal and oil grow scarcer we will probably have to make more and more of our electricity from the power of falling water . Transformer Power ...
... coal or oil power stations . But they are much cheaper to run . They do not need any fuel . As coal and oil grow scarcer we will probably have to make more and more of our electricity from the power of falling water . Transformer Power ...
Pàgina 54
... coal mines to make the ladened wagons move more easily . But with the inven- tion of the steam engine railways com- pletely changed travel on land . The first public railway to use steam locomotives was the Stockton and Dar- lington ...
... coal mines to make the ladened wagons move more easily . But with the inven- tion of the steam engine railways com- pletely changed travel on land . The first public railway to use steam locomotives was the Stockton and Dar- lington ...
Altres edicions - Mostra-ho tot
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