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Soil erosion and pollution /
The soil is the brown layer that wraps our planet. This is the more or less crumbly mass which manages the plant roots. Formed soil can be several feet thick or thin just a few inches. However, only the top layer of 10-30 cm is made ??up of fertile topsoil. If our Earth would one day run out of the...
| Cote: | TD878 S7.44 |
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| Auteur principal: | |
| Format: | Livre |
| Langue: | Español Inglés |
| Publié: |
Chicago :
Children,Press,
©1990.
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| Collection: | A New True Book
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| Sujets: |