Cinder knobs

Take a look at the brick-red cinder knobs indicated by the sign. Cinders, more formally known as scoria, are blobs of basaltic lava that get ejected during a volcanic eruption and harden in the air. They have a fine vesicular texture caused by rapidly escaping gas, and they are commonly red due to oxidation of the iron in the basalt. In this case, multiple chunks of scoria were welded together. Can you notice the differences in the size and arrangement of the vesicles in the scoria compared to the vesicles in the basalt that you observed earlier?