Zusammenfassung der Ressource
Fossils
- Impressions on rocks
- Igneous, sedimentary, metamorphic
- Formation of fossils
- organisms disintegrate after death
- Significance of fossils
- Tell us about past
- Fossil Fuels
- Drawback
- Coal, Petroleum, Natural Gas
- Energy Crisis
- Imports of oil and petroleum increasing
- Sun-the ultimate source of energy