Foot
The Clashing Rocks.
Birds have gizzards that rely on small pebbles to help grind the food they ingest. The human animals' use of rocks is breathtaking in scope. Sea otters use rocks to break shells of sea creatures before eating them.
sedimentary rocks can be changed into metamorphic rocks by the use of pressure and/or heat
they use senses
use the hm dive
Tranquilly, the sea lapped over the rocks
Karana in "Island of the Blue Dolphins" would gather sea urchin spines and attach them to a long stick to use as a tool for scraping scallops off rocks. This method allowed her to collect scallops for food.
they use tube feet on the bottom of their rays to move
Sea urchins, sand dollars, and sea stars are classified in the phylum Echinodermata. They have a spiny exterior and tube feet that they use for movement and feeding.
As birds have no teeth they swallow pebbles to use in their gizzards as grinders. Seals and sea lions will swallow rocks to use as ballast. Sea otters will use rocks as bashers to open up sea urchins and the like. Gull and Crows will drop nuts and shells on rocks to break them open.
Metals dissolved from rocks, enter sea Introduced by hydrothermal vents Organisms use metals in ratios from sea