What type of basaltic feature is shown in this photograph?

Question

Quizplus · Accepted Answer

The photograph shows a smooth, undulating, rope-like texture on the surface of the rock, which is indicative of a pahoehoe lava flow. Vesicles are cavities or bubbles within the rock that form when gases escape during solidification, but there are no visible vesicles in this photograph. A volcanic bomb is a large, rounded mass of lava that is ejected during an explosive eruption and solidifies in the air before hitting the ground, but there is no evidence of a bomb shape in this photograph. Aa lava flows are generally rough and jagged, with sharp, angular pieces of solidified lava, whereas the surface of the rock in this photograph is smooth and contoured. Pyroclastic flows are dense, rapidly moving currents of volcanic ash, lava fragments, and gases that flow down the sides of a volcano during an explosive eruption, but there is no sign of ash or other volcanic debris in this photograph.

What Type of Basaltic Feature Is Shown in This Photograph