|A: organic matter trapped in sedimentary rock|
|B: nonorganic matter trapped in metamorphic rock|
|C: organic matter trapped in igneous rock|
|D: organic matter on the crust's surface|
2)Coal, a common fossil fuel, is formed from which of the following types of organic matter?
|A: freshwater algae|
|B: bodies of dead animals|
|C: marine organisms|
|D: tree trunks, leaves, and freshwater plants|
3) Oil and gas are mainly derived from which of the following sources?
|A: trees and larger plants|
|B: phytoplanktonic material found in marine basins|
|C: freshwater algae|
|D: dead animals|
4) Why do fossil fuels generate more power than wood for use in machines, for example?
6) The greatest concentration of oil is found in which of the regions of the world given below?
|A: North America|
|B: South America|
|C: the Middle East|