01st January, 2017 (CSAT)



Despite advances in geothermal technology and equipment, experts rarely agree which method is the best indicator of a likely source of oil. Some believe the cycle of environmental changes determines the primary sources for crude oil, while others look to the evolution of organic matter as the most significant indicator. What they do agree on, however, is where oil won’t be found. They agree that in areas that were scraped clean of organic sedimentary deposits by glaciers during the last million years or so, the biological “ingredients” that they believe are necessary for the formation of oil and gas are not present. That is, where glaciers have scoured a landmass, oil and gas will not be found.

1. If all of the information above is true, which one of the following can be reasonably inferred?

(a) Geologists understand some of the physical conditions necessary for the formation of deposits of oil.

(b) Scientists leave open the possibility that oil may have been formed during the last million years in some regions that were covered by glaciers during the same period.

(c) Geologists can, with a fairly high degree of accuracy, predict whether an area that meets the necessary preconditions for the formation of oil will, in fact, yield oil.

(d) Geologists can, with a fairly high degree of accuracy, predict whether oil can be found in a particular landmass that was not scoured by glaciers.


2. Which one of the following, if true, would most seriously weaken the geologists’ view?

(a) Relatively little of the Earth’s surface is known to rest above the sort of organic sedimentary deposits described above.

(b) Despite the existence of permanent glaciers, oil has been found at both the North and South Poles.

(c) There are too many variables involved for experts to be able to identify what does and does not need to be present for the formation of oil.

(d) Oil deposits exist below the crust of the entire Earth, and are brought nearer to the surface by cracks in the crust.

Tomorrow: Next questions for practice

For previous questions refer yesterday’s post

Click on MAINS and PRELIMS pages also.