A clastic sedimentary rock composed of pebbles (40%), cobbles (25%), boulders (10%) and sand (25%; even amounts of quartz and feldspar) would be called a(n)

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The rock is primarily composed of pebbles, cobbles, and boulders, making it a conglomerate. The sand component, which is evenly split between quartz and feldspar, would indicate that it is a sandy conglomerate.

A Clastic Sedimentary Rock Composed of Pebbles (40%), Cobbles (25%)