Silica: sesquioxide (R₂O₃) ratio for tropical ecoregion is

A. > 5.5

B. 3 to 4.5

C. 1 to 2

D. < 2

Answer: Option D

Solution(By Examveda Team)

Sesquioxide ratio is the ratio of the number of molecules of silica to the number of molecules of alumina and iron oxide. The more highly weathered soils or their clay fractions in warm temperate, humid regions and especially those in the tropics, generally have a low ratio. The ratio is < 2 for tropical ecoregion.