1. Section 4.2-The Hydrosphere Big Idea: Water shows itself in many different forms. Get out a piece of paper for 4.2 notes and write the Big Idea below.

2. Water on Earth 97% salty, 2% frozen fresh, 1% usable Desalination-process used to remove salt from fresh water Amount of water never changes Hydrologic Cycle-Water Cycle...Pg. 70 What are the forces that drive the hydrologic cycle and how does each force drive the cycle?

3. Floods- Too much water and no where for it to go Levees: man-made structures of dirt, rock and concrete Levees are designed to protect habitat Levees cause problems for civilians downstream

4. Headwaters-tributaries-watershed (drainage basin) Estuaries-form when river meets an inlet, or small arm, of the sea… fresh and saltwater mix Wetlands-any landscape that is covered with water for at least part of the year –Many have been drained for farming and building (Everglades)

5. Groundwater- Water found below ground Water table -area where ground underneath is completely saturated-fluctuates based on amount of rain or well usage. Lowering of table could lead to settling, slumping or cracking.