The spine of the whale is a small fault which has allowed a trickle of water through. Over time, the water enlarged a space which it eagerly filled, and as time went on, the water dug deeper, leaving rib-like ridges in the wall, called rills.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue