close up of patterned igneous rock with harbor and skyline in background

low elevation coastal community sea level necessitates necessity boulder sized particles local resource impediment impede waves storm surge nuisance flooding waters sea ocean scoria vesicles vesicular texture textural volcanology runny lava gas pockets weathering oxidized umber rusty red gray grey black nature natural details city planning infrastructure preparation investment protect Iceland nordic scandanavia earth science geology geoscience petrology igneous metamorphic sedimentary formation visit modern buildings calm pedestrians flow fluid hydrodynamics solidified solidification