Environmental Science for AP* (2nd Edition)

Published by W. H. Freeman
ISBN 10: 1464108684
ISBN 13: 978-1-46410-868-6

Chapter 4 - Module 13 - Aquatic Biomes - AP Review Questions - Page 139: 5



Work Step by Step

Earth's ocean can be defined as an open ocean that can be divided into 3 sections according to its depth (Not surface area). The upper layer recieves the most sunlight and more photosynthetic life occurs here. The middle layer still has sunlight but not as much as the upper layer. Lastly, the bottom layer can be considered a dead zone. Not much life exists here because there is little to no sunlight.
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