6 Tributaries flow toward the main river following a downhill path due to gravity.
7 Remember! GRAVITY causes water to flow. Lakes, river and streams all flow towards the ocean. This is called SEA LEVEL. All land areas are measured in distances above sea level. Solon, Ohio is 1040 feet above sea level.Water continues to flow toward sea level.
8 Water that seeps below Earth’s surface becomes groundwater.
9 Large pockets of groundwater are called aquifers.
10 Topography is the study of the shape of land; its elevation, relief and landforms.
11 As you know, elevation refers to feet above sea level As you know, elevation refers to feet above sea level. Relief has to do with the highest and lowest parts of an area.
16 Contamination = Pollution Water pollution is the addition of any substance that has a negative impact on water or the life in it. Water pollution can happen in all spheres! That is air, groundwater, lakes, rivers, streams or oceans.
17 Main sources of water pollution include: human wastes, industrial wastes, agricultural chemicals and runoff from roads.
18 Pollution that can be traced to a source is called point source pollution. Pollution that cannot be traced to a source is nonpoint source pollution.