Scientists recently discovered that rocks collected from the Franklin Mountains in West Texas and rocks collected from mountains in Eastern Antarctica were exactly the same age. Further researched showed that the rocks were chemically and geologically the same and came from the same magma source. A:glacial melting
B. ocean currents
C. coastal erosion
D. plate tectonics

it is the most commonly accepted one

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.