Hydrology-Water, water, everywhere!

1. Hydrosphere-all the water on the Earth

2. 75 percent or 3/4 of the Earth's surface is covered in water.

3. saltwater- 97% of the Earth's water is saltwater.

4. freshwater- 3% of the Earth's water is fresh

5. 2/3rds of the freshwater is frozen in glaciers and icecaps

6. 1/3rd of the freshwater or 1% of all the water on Earth is useable by humans!

7. salinity-saltiness of the water. ocean water has 3.5% salinity.

8. 5 main sources of freshwater- glaciers and ice caps, groundwater, lakes, atmosphere, and rivers. These contain 3% of the hydrosphere.

9. 1% useable by humans-groundwater, lakes, rivers, and atmosphere.

10. groundwater-most of the freshwater that we use is found underground in aquifers

11. aquifer-underground area of permeable rocks where water is stored.