Here's why:
* Conglomerate is a clastic sedimentary rock made up of rounded gravel-sized fragments (pebbles, cobbles, and boulders).
* The rounded shape of the pebbles indicates that they were transported a significant distance by water or wind, which smoothed their edges.
* Breccia is another clastic sedimentary rock composed of gravel-sized fragments, but these fragments are angular, indicating they were transported a shorter distance and haven't been rounded by erosion.
Let me know if you have any other questions about sedimentary rocks!
