13. Ocean Topography 4 The ocean floor is not flat, there are mountains and valleys
14. Ocean Currents and Tides Ocean currents are rivers in the ocean. Ocean currents are also not caused by a downhill force like a river on a mountain.
15. Ocean Currents and Tides 2 There are two kinds of tides, high tide and low tide. At high tide the water near the shore gets deeper and at low tide it gets shallower. Tides are caused by the gravitational pull of the moon.
16. Ocean Currents and Tides 3 Each tide happens twice a day. People can predict the tides.
18. How Do Humans Effect the Water Humans effect the water by building dams.
19. How Do Humans Effect the Water 2 Humans also effect the water by waging war and sinking NUCLEAR vessels.
20. Resource list The resources that I used were The Magic School Bus on the Ocean Floor, and The Magic School Bus at the Waterworks by: Joanna Cole and Bruce Degen.