1. Oceanography

2. WATER Essential Question: –Why is water essential to life on Earth? Objectives: –Discuss and investigate properties of water

3. Water Facts Exists in solid, liquid and gas forms Covers 70% - 75% of Earth 4 Oceans: Pacific, Atlantic, Indian, Arctic N. Hemisphere: 61% S. Hemisphere: 81% Average Depth: 3,800 m

4. 97% Saltwater 3% Freshwater Most freshwater located in glaciers Sea Level – Level of ocean water, varies due to melting of glaciers

5. Water is tasteless and odorless Water is transparent - light can pass through Water is a strong solvent, mixes well with other substances (salt, sugar, CO 2 )

6. Chemical Formula: H 2 O Boiling temp: 100 ºC Freezing temp: 0 ºC

7. Water Cycle

8. Water Cycle Evaporated from Earths surface Transpired from trees and plants Condensed into water droplets, forms clouds Precipitates back to Earth Runoff into large bodies of water, enters ground The cycle repeats

9. So… why is water SO important? Determines climate and weather Shapes the landscapes on Earth through weathering and erosion Supports life on Earth (Plants and Animals) –Agriculture, Drinking Form of energy – Hydro-power Recreation Cleaning – shower, clothes

10. Cohesion –Water molecules sticking together Adhesion –Water molecules sticking to other substances Surface Tension –Waters resistance to objects attempting to break through its surface Properties of Water