...but not old enough to have weathered down. Iceland is made of lava, as is Hawaii, but the Hawaiian islands are much older* which is why they are now a garden paradise.
*Except the big island which is young enough to still have active volcanoes like Iceland.
https://www.nytimes.com/interactive/2017/10/20/climate/icela...
A lot of the roughness in the terrain is because there are lots of old lava fields