Biology chapter 3 3.3rq

1.Why is the globe of Earth mainly blue.
2.List three major freshwater ecosystems:
3.Define sediment:
4.What is an important characteristic of all life in rivers and streams?
5.What is the major source of food for fish in slow moving water?
6.Describe an oligotrophic:
7.Define littoral zone:
8.Define limnetic zone:
9.Define plankton:
10.Define profundal zone:
11.List two characteristics of a wetland:
12.Define estuary:
13.Define intertidal zone:
14.Define photic zone:
15.Define aphotic zone:
16.Define benthic zone:
17.Define abyssal zone:
18.Where is the world’s largest coral reef?