Porous sand stone rocks on Jalandhar Beach near the south pole point in Diu, India, Asia

Porous sand stone rocks on Jalandhar Beach near the south pole point in Diu, India, Asia

Detail of a sponge growing on a reef in Lembeh Strait, Indonesia.

Wild saltwater crocodile (Crocodylus porosus) head detail in porous creek on the Hunter River, Mitchell River National Park, Kimberley, Western Australia, Australia, Pacific

Wild saltwater crocodile (Crocodylus porosus) head detail in porous creek on the Hunter River, Mitchell River National Park, Kimberley, Western Australia, Australia, Pacific

marine iguana lizard resting on dark porous lava rock propped up on front legs vegetation in background frontal view of one animal only outdoors horizontal format Galapagos Islands Ecuador South America Americas

Concrete pattern