Question

what is meaning of coars, porous,crumbly

Answer 1

“LOOSE AND FULL OF HOLES.” Those and other common descriptions of what healthy soil looks and feels like refer to good soil structure. ... When the solid parts—sand, silt and clay particles—cling together as coarse, granular aggregates, the soil has a good balance of solid parts and pore space.

Answer 2

The meaning of coarse is 'composed of large parts or particles'.
The meaning of porous is 'full of tiny pores that allow fluids or gasses to pass through'.
The meaning of crumbly is 'easy to break into small fragments'.