1. Unit 2.2- Ocean Topography and Chemistry

2. Home Room Bell Work Oct 15 Agenda: 1.Bell Work 2.Pledge of Allegiance 3.Finish Bell Work 4.New students in class 5.Good Things 6.Lunch Count Bell Work: On an Index card, write down 3 facts about yourself that no one in the room knows, but you would like them to know Write your name on the card and turn it in

3. Bell Work Oct 15 Agenda: 1.Planner: Draw and label a plan for the Ocean Floor Paper Mache Diagram Project 2.Bell Work 3.Did you Know? 4.Notes 5.Walk the Ocean Floor 6.Homework Bell Work: Read the “Did you Know” Fact Sheet Pick out 2 Facts that you found particularly interesting

4. Vocabulary of Ocean Floor Continental Shelf: Part of the continental crust; the area of seabed around a large landmass where the sea is relatively shallow Continental Slope: the slope between the outer edge of the continental shelf and the deep ocean floor Continental Rise: found between the continental slope and the abyssal plain

5. Vocabulary of Ocean Floor Abyssal Plains: Generally between the continental rise and a mid-ocean ridge; smooth flat regions Mid-Ocean Ridge: Underwater mountain range formed by plates diverging Trench: Underwater trenches formed by convergent boundaries; deepest part of the ocean Facts: The average depth of sediment is 0.3miles Sediment consists of rock particles and organic remains (dead stuff) Scientists use sonar to investigate the bottom of the ocean

6. Ocean Floor Diagram Please draw and label in your notes

7. Ocean Floor Project Objective: Make an accurate paper mache model of the ocean floor with the following features: Continent Continental Shelf Continental Slope Continental Rise Abyssal Plain Mid-Ocean Ridge Trench

8. Home Room Bell Work Oct 16 Agenda: 1.Bell Work 2.Pledge of Allegiance 3.Finish Bell Work 4.Good Things 5.Lunch Count Bell Work: With your partner, pick/revise your plan for the model Raise hand for plan approval

9. Bell Work Oct 16 Agenda: 1.Bell Work 2.Make Ocean Floor Model Bell Work: Pick/revise a plan for your project Raise your hand to get approval

10. Home Room Bell Work Oct 17 Agenda: 1.Bell Work 2.Pledge of Allegiance 3.Good Things 4.Lunch Count Bell Work: Bring your project to your desk

11. Bell Work Oct 17 Agenda: 1.Bell Work 2.Graph Ocean Floor Model Bell Work:

12. Home Room Bell Work Oct 20 Agenda: 1.Bell Work 2.Pledge of Allegiance 3.Good Things 4.Lunch Count Bell Work:

13. Bell Work Oct 20 Agenda: 1.Planner: Take Home Lab Due Thurs 1.Salinity Variation Sheet Due Wed 2.Bell Work 3.Notes 4.Egg Lab Bell Work:

14. Ocean Chemistry On average, 1kg of ocean water contains 35 grams of salt Ocean water is 3.5% salt Salt Water Demo Salinity: The total amount of dissolved salts in a sample of water Salt Examples: Sodium Chloride (also called table salt) Potassium Chloride Magnesium Chloride

15. Salts When salts dissolve in water, they separate into particles called Ions Example: If I dissolve sodium chloride (NaCl) into water, it will make sodium ions (Na) and chlorine ions (Cl)

16. Variations in Salinity Most parts of the ocean have a salinity of 3.4% -3.7% Near the ocean surface, rain, snow, and melting ice lower salinity Why? Hot/dry climates can increase salinity Why? Red Sea: 4.1% Salinity can be higher near the poles Why?

17. Effects of Salinity Salt water freezes at a lower temperature Salt interrupts the water molecules and keeps them from forming a solid Salt water is more dense than fresh water This effects buoyancy (causes things to float easier)

18. Temperature of Ocean Water Surface temperatures are higher near the equator (absorbs energy from the sun) Warm water is less dense than cold water Deep water is colder and denser

19. Gases in Ocean Water Carbon dioxide and oxygen are dissolved in water Algae needs carbon dioxide for photosynthesis Oxygen more plentiful near the surface Comes from the air and algae Amount of oxygen is effected by temperature Cold water = more oxygen Warm water = less oxygen