To compare natural pozzolana (NP) and ground granulated blast-furnace slag (GBFS) based on the specified criteria of morphology and relative density, we can look at each aspect in detail.
### a) Morphology of Ground GBFS Particles
**Natural Pozzolana (NP)**
- **Morphology**: Natural pozzolana consists of volcanic ash and pumice that typically have irregular shapes and sizes. This irregularity contributes to a larger surface area relative to


