In such a rough landscape you feel somewhat out of place. The slow streaming of the lava gave rise to rough surfaces. A rapid drop of temperature of the molten rock may produce irregularities and clefts. Besides gray and black as a prominent colour, yellow-greenish surfaces may also draw your attention.
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When the flow of molten lava is slow they also form rather smooth surfaced and large rocks with obvious stratification. Large grooves occur between these masses.
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The air bubbles trapped within the molten lava create spaces of varying size; from microscopic to miles long volcanic caves. Do you see the laminar formation of the volcanic mass?
