Basalts are a type of volcanic rock that is formed when lava cools and solidifies. There are several synonyms for basalts, such as black rock, volcanic stone, lava rock, and igneous rock. Black rock describes the color of basalts, while volcanic stone emphasizes its volcanic origin. Lava rock refers to its molten state before it cools down, and igneous rock is a geological term that classifies rocks that are formed by the solidification of magma or lava. Knowing the synonyms for basalts can aid in better understanding and communication about geological processes and formations.