Air Earth Crust Oxygen on Earth H 2 O (oceans) O 2, CO 2 (atmosphere) CO 3 (rocks, coral, seashells) SiO 2, silicates (sand, clay, rocks) Made commercially.
Atmosphere Water and Air… the two essential elements on which life depends have become global garbage cans.
Intertidal Ecology Rocky Shores Sandy Shores: sandy beaches Muddy Shores: mud flat.
