Here's why:

* Clastic: Conglomerate is formed from fragments of other rocks, called clasts.

* Large Grain: The clasts in conglomerate are typically larger than 2 millimeters in diameter, meaning they can be easily seen with the naked eye. They often include pebbles, cobbles, and even boulders.

* Examples: You can find conglomerate in riverbeds, beaches, and ancient mountain ranges.

Let me know if you'd like to learn more about other clastic rocks!