1. Do we have one ocean or several oceans?

2. Once water leaves the e______, it heads out to the ocean.

3. Once water leaves the estuary, it heads out to the ocean.

4. Oceans make up about __% of our Earth surface.

5. Oceans make up about 70% of our Earth surface.

6. Are all oceans our connected?

7. All oceans are connected!
HOW?

8. OCEAN WATER PROPERTIES LAB

9. Write these ANALYSIS QUESTIONS:
The more salt dissolves in water, the ________ dense this ocean water is.
The colder liquid water gets, the __________ dense the liquid ocean gets. Until it freezes to ice, then it gets __________ dense.
Two (2) ways to change the density (m/v) of ocean water are: _____________ & _______________
What moves surface currents: __________________
What moves deep water currents: changes in water _______________

10. Now draw a line under these questions, we’ll get back to these later.

11. Lab part 1: SALINITY & DENSITY.
Fill cup 2/3rds full of tap water

12. Which has more density (mass/volume) carrots or potatoes?

13. Which has more density (MASS/volume) carrots or potatoes?
You could weigh us all…

14. Which has more density (MASS/VOLUME) carrots or potatoes?
You could weigh us all…
…but we are all different sizes!

15. Which has more density (mass/volume) carrots or potatoes?
Place your carrot in cup.

16. Which has more density (mass/volume) carrots or potatoes?
Place your carrot in cup.
Carefully add ONE FLAT teaspoon of salt to your cup of water.

17. Which has more density (mass/volume) carrots or potatoes?
Place your carrot in cup.
Carefully add 1 FLAT teaspoon of salt to your cup of water.
Stir gently until salt is dissolved.

18. Which has more density (mass/volume) carrots or potatoes?
Place your carrot in cup.
Carefully add 1 FLAT teaspoon of salt to your cup of water.
Stir gently until salt is dissolved.
Repeat another FLAT teaspoon one-at-a-time, stirring until the carrot floats.
_________ tspns of NaCl salt to make CARROT float.

19. Which has more density (mass/volume) carrots or potatoes?
Place your carrot in cup.
Carefully add 1 FLAT teaspoon of salt to your cup of water.
Stir gently until salt is dissolved.
Repeat another FLAT teaspoon one-at-a-time, stirring until the carrot floats.
_________ tspns of NaCl salt to make CARROT float.
RECORD!

20. Rinse out cup and refill with 2/3rds fresh water.
1 person per group!

21. Repeat the same steps you did with the carrot, but with a POTATO.
Place your potato in cup.
Carefully add 1 FLAT teaspoon of salt to your cup of water.
Stir gently until salt is dissolved.
Repeat 1 FLAT teaspoon at-a-time, stirring until the potato floats.
_________ tspns of NaCl salt to make POTATO float.

22. Did the carrot or the potato need more salt to float?

23. So, which do YOU think has more density (mass/volume)… CARROTS or POTATOES?

24. So, which do YOU think has more density (mass/volume)… CARROTS or POTATOES?

25. POTATOES have greater density than carrots.
So, which do YOU think has more density (mass/volume)… CARROTS or POTATOES?
POTATOES have greater density than carrots.

26. How did you figure a potato is more dense than a carrot?

27. Salt (NaCl) gets in between water molecules adding more mass in the same volume...the more salt means more salty water can lift denser stuff!

28. What’s happening to the density of the water as you add more salt?
SALT WATER has MORE DENSITY than FRESH WATER!

29. As salinity increases, water gets ________ dense.

30. More mass in the same volume.

31. As salinity increases, water gets more dense.

32. Clean-up part 1 Get back into seats and focus front.
Rinse out and clean your cups.
Dry off carrots and potatoes return to Mr. G.
Get back into seats and focus front.

33. Part 2: Temperature & density

34. Ice sure is weird, Mort.

35. How do you figure, Norm?

36. Ice is water as a solid, isn’t it?

37. 2/3rds of all freshwater, yep.

38. Aren’t solids supposed to have the most compact atoms & molecules?

39. My feet are cold.

40. Everyone’s feet are cold, Larry. So what’s your point, Norm?

41. When something gets more compact, it gets more dense.

42. Your point?

43. Solid water floats over liquid water, dude.

45. Whoa.

46. I’m aquatic.

47. Solid H2O (ice) is ______ dense than liquid water

48. Solid H2O (ice) is LESS dense than liquid water
Remember that water is a POLAR molecule (with a positive H side and negative O side)

49. Is cold liquid water more dense than warm liquid water?
You should have rinsed out and cleaned your cups, carrots and potatoes, returned to seats, focused front & continued note-taking.
After Mr. G sees you’re all done, raise your hand.
With his approval, fill your cup with warm water at the front of class.

50. Is cold liquid water more dense than warm liquid water?
With his approval, fill your cup with warm water at the front of class.
Mr. G will give each group an ice cube with red dye. Place it atop your warm water. Observe.

51. Is cold liquid water more dense than warm liquid water?
Where does the cool (red) water go as it melts from the solid ice?
Does the cooler red water stay at the top of your cup or drop towards the bottom?

52. Is cold water more dense than warm water?
While ice is _______ dense than liquid water, cold water is _______ dense than warm water.

53. Water density:
While ICE is LESS DENSE than LIQUID WATER (ice FLOATS after all),
COLD LIQUID water is MORE DENSE than WARM LIQUID water.

54. Water density: H2O(ice) < H2O(warm) < H2O(cool)
While ICE is LESS DENSE than LIQUID WATER (ice FLOATS after all),
COLD LIQUID water is MORE DENSE than WARM LIQUID water.
H2O(ice) < H2O(warm) < H2O(cool)

55. Clean-up.
Return tubs

56. Do your ANALYSIS!
The more salt dissolves in water, the ________ dense this ocean water is.
The colder liquid water gets, the __________ dense the liquid ocean gets. Until it freezes to ice, then it gets __________ dense.
Two (2) ways to change the density (m/v) of ocean water are: _____________ & _______________
What moves surface currents: __________________
What moves deep water currents: changes in water _______________

57. Day 2…

58. Did you DO your ANALYSIS?
The more salt dissolves in water, the ________ dense this ocean water is.
The colder liquid water gets, the __________ dense the liquid ocean gets. Until it freezes to ice, then it gets __________ dense.
Two (2) ways to change the density (m/v) of ocean water are: _____________ & _______________
What moves surface currents: __________________
What moves deep water currents: changes in water _______________

59. Did you DO your ANALYSIS?
The more salt dissolves in water, the MORE dense this ocean water is.
The colder liquid water gets, the __________ dense the liquid ocean gets. Until it freezes to ice, then it gets __________ dense.
Two (2) ways to change the density (m/v) of ocean water are: _____________ & _______________
What moves surface currents: __________________
What moves deep water currents: changes in water _______________

60. Did you DO your ANALYSIS?
The more salt dissolves in water, the MORE dense this ocean water is.
The colder liquid water gets, the MORE dense the liquid ocean gets. Until it freezes to ice, then it gets __________ dense.
Two (2) ways to change the density (m/v) of ocean water are: _____________ & _______________
What moves surface currents: __________________
What moves deep water currents: changes in water _______________

61. Did you DO your ANALYSIS?
The more salt dissolves in water, the MORE dense this ocean water is.
The colder liquid water gets, the MORE dense the liquid ocean gets. Until it freezes to ice, then it gets LESS dense.
Two (2) ways to change the density (m/v) of ocean water are: _____________ & _______________
What moves surface currents: __________________
What moves deep water currents: changes in water _______________

62. Did you DO your ANALYSIS?
The more salt dissolves in water, the MORE dense this ocean water is.
The colder liquid water gets, the MORE dense the liquid ocean gets. Until it freezes to ice, then it gets LESS dense.
Two (2) ways to change the density (m/v) of ocean water are: TEMPERATURE & SALINITY
What moves surface currents: __________________
What moves deep water currents: changes in water _______________

63. Did you DO your ANALYSIS?
The more salt dissolves in water, the MORE dense this ocean water is.
The colder liquid water gets, the MORE dense the liquid ocean gets. Until it freezes to ice, then it gets LESS dense.
Two (2) ways to change the density (m/v) of ocean water are: TEMPERATURE & SALINITY
What moves surface currents: WINDS, EARTH ROTATION
What moves deep water currents: changes in water _______________

64. Did you DO your ANALYSIS?
The more salt dissolves in water, the MORE dense this ocean water is.
The colder liquid water gets, the MORE dense the liquid ocean gets. Until it freezes to ice, then it gets LESS dense.
Two (2) ways to change the density (m/v) of ocean water are: TEMPERATURE & SALINITY
What moves surface currents: WINDS, EARTH ROTATION
What moves deep water currents: changes in water DENSITY

65. What connects all our oceans?

66. Surface & deep water currents.
Surface & deep currents move all Earth’s salt water around

67. Surface & deep water currents.
Surface & deep currents move all Earth’s salt water around

68. Why should we care????

69. Look at Mars!
At the Mars equator, daily spring temperatures go from 43 oF above zero down to -94 oF below zero at night! IN ONE DAY!

71. Here’s Earth…

72. Here’s Earth…

73. Our OCEAN CURRENTS help MODERATE (balance) our EARTH's TEMPERATURES!

74. REMEMBER…WATER (H2O) takes a long time to heat up and cool down…
low specific heat
HIGH SPECIFIC HEAT
SAND
AIR
ALUMINUM FOIL
McDonalds fries
WATER
LASAGNA
THANKSGIVING TURKEY

75. Earth’s water keeps us WARM in the WINTER & COOL in the SUMMER with HIGH SPECIFIC HEAT!
wksheet…

76. End…