Correct Answer - Option 2 : Air cooled slag
Explanation:
Granite: Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other minerals.
Air cooled slag: Air-cooled slag is solidified under ambient conditions. Immediately after being discharged from the blast furnace, the molten blast furnace slag is dumped into cooling pits for air-cooling before further processing for slag products.
Basalt: Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals.
Sandstone: Sandstone is a sedimentary rock composed of sand-size grains of mineral, rock, or organic material.
