F. Give reasons for the following. 1. Petroleum is called black gold. 2. It takes a long period of time to form metamorphic rocks. 3. Fossils are seen mostly in sedimentary rocks. 4. Some minerals are also used as fertilizers. 5. Pumice floats on water.
Answers
1 The Petroleum is called black gold because when the crude oil is extracted from the soil below, it is black in colour. Petroleum is very expensive like gold. ... But after the purification of black crude oil, it gives golden colour. So, this is another reason for its name.
3 Fossils, the preserved remains of animal and plant life, are mostly found embedded in sedimentary rocks. Of the sedimentary rocks, most fossils occur in shale, limestone and sandstone. ... With rare exceptions, metamorphic and igneous rocks undergo too much heat and pressure to preserve fossils.
5 Pumice stones. While scientists have known that pumice can float because of pockets of gas in its pores, it was unknown how those gases remain trapped inside the pumice for prolonged periods. If you soak up enough water in a sponge, for example, it will sink.
Ans 4 in attachment
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