1. Ocean Water SWBAT state the importance of Earth’s oceans; discuss the origin of the oceans; describe the composition of seawater; explain how temperature and pressure vary with depth

2. Importance of Oceans  How much of Earth’s surface do oceans cover? 75% 75% “The Water Planet” “The Water Planet”  What do oceans provide for us? Place for organisms to live Place for organisms to live Produce 70% of oxygen on EarthProduce 70% of oxygen on Earth Transportation Transportation Resources Resources FoodFood MedicineMedicine SaltSalt

3. Formation of Oceans  Scientists say that gases, such as water vapor, were released by volcanoes over 4 billion years ago. According to Genesis 1, how were oceans formed?

4. Composition of Ocean Water  Salinity a measure of the amount of solids, or salts, dissolved in seawater a measure of the amount of solids, or salts, dissolved in seawater  How much salt does seawater contain? Watch demo Watch demo We used 35mL of salt for 965 mL of water. What percentage is that? We used 35mL of salt for 965 mL of water. What percentage is that?

5. Composition of Ocean Water  Photosynthesis a process in which organisms use sunlight, water, and carbon dioxide to make food and oxygen a process in which organisms use sunlight, water, and carbon dioxide to make food and oxygen

6. Temperature Layers  Surface layer Warmest layer, especially around the equator, where the sun’s rays hit more directly. Warmest layer, especially around the equator, where the sun’s rays hit more directly.  Thermocline Layer of ocean where the temperature drops quickly with depth Layer of ocean where the temperature drops quickly with depth Often begins at a depth of about 200 m Often begins at a depth of about 200 m

7. Temperature Layers  Deep-water layer Coldest layer Coldest layer Dark Dark

8. With a partner  Start your homework  Page 378, 1-4  Answer in complete sentences