The primary difference between breccia and conglomerate is that conglomerate . a. possesses more angular grains than breccia b. is coarser grained than breccia c. is finer grained than breccia d. possesses more rounded grains than breccia

D. POSSESS MORE ROUNDED GRAINS THAN BRECCIA.

Explanation:

Breccia are sedimentary rocks that are made up of large angular fragments while conglomerate are also clastic sedimentary rocks with rounded particules. These two rocks have particles larger than two millimeters in diameter and the primary difference is in the shape of particules.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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