According to Vastu Shashtra four types of soil in face varnas, those are;
a. Type 1 Soil
b. Type 2 Soil
c. Type 3 Soil
d. Type 4 Soil
The type 1 soil in which is white and yellow colour smell as well as ghee and test is a sweet, it beneficial in any ways.
The type 2 soil which is in red colour, smell in blood and test in honey and sour is useful to get Patrick and Governmental wealth.
The type 3 soil in which is light green colour and smell in cereals and test in sour ( amla ) to beneficial for health and wealth.
The type 4 soil in which is black colour , smell in wine and test in foul it harmful for flat /house owner.
So we should examine the soil and build a house, flat and etc.