MARINE

SCIENCE

Monday

19 Mar 2018

Entry TaskHow may some salt be removed from the ocean?

• When organisms, such as fish, are removed from the ocean.

What is the unit of measurement used for dissolved salts in the

ocean? What is the average salinity of the ocean?

• Parts per thousand (0/00)

• 35 0/00

Agenda Housekeeping

Unit_03 Nature of Seawater

HousekeepingSummative assessment next Tuesday, 27 Mar.

• Unit_03 Nature of Seawater

• One 3x5 index card (front & back) will be allowed.

Early release schedule next week, Wednesday - Friday,

28-30 Mar.

• Sending out progress reports by the end of this week.

Nature of SeawaterA lot of missing lab workbooks. Earn some credit by completing

part 3 of the lab.

Grab a ChromeBook from the cart.

• Be sure to grab the number that corresponds to the number

on your desk.

• Go to the “Our Acidifying Ocean” website @

http://i2sea.stanford.edu/AcidOcean/AcidOcean3.htm (You

can also navigate to the site by searching for “Our Acidifying

Ocean” & Stanford).

• Navigate through part 3 of the virtual lab, complete all

questions on the workbook.

Note: “The Acidifying Ocean” virtual lab workbook can be

located on the Marine Science webpage @ link:

https://www.steilacoom.k12.wa.us/Page/6601

MARINE

SCIENCE

Tuesday

20 Mar 2018

Entry TaskBased on part 3 of the virtual lab, what does percent loss mean?

Explain.

• Ocean acidification produces less calcium carbonate,

therefore organisms have less to create internal structures &

are smaller.

Agenda Housekeeping

Unit_03 Nature of Seawater

HousekeepingSummative assessment next Tuesday, 27 Mar.

• Unit_03 Nature of Seawater

• One 3x5 index card (front & back) will be allowed.

Early release schedule next week, Wednesday - Friday,

28-30 Mar.

• Sending out progress reports by the end of this week.

Nature of SeawaterSeawater: So Much to See, So Little to Drink

• Some salt is removed when organisms, such as fish, are

taken from the ocean.

Nature of SeawaterSalinity: Water & Salt

• Amount of dissolved salts in seawater is measured in parts of

dissolved salts per 1,000 parts water (parts per thousand 0/00)

• Average salinity of the ocean is 35 parts per thousand

(35 0/00)

Salinity: Water & Salt

• Salinity differs from one

• Some bodies of water are they are in

hot, dry areas.

• Areas with high evaporation & low

precipitation such as:

- Mediterranean Sea

- Red Sea

- Dead Sea

- Persian Gulf

- Great salt Lake

- Gulf of Mexico

Nature of SeawaterSalinity: Water & Salt

• Salinity differs from one location to another.

• Some bodies of water are considered hypersaline because

they are in hot, dry areas.

Nature of SeawaterSalinity: Water & Salt

• Salinity can also differ according to latitude.

• 20° north & 20° south latitudes the salinity is about 36 0/00

What do you think the salinity is like at the equator?

?

Nature of SeawaterSalinity: Water & Salt

Salinity: Water & Salt

• Rivers & streams enter

ocean freshwater.

• Salinity can also change with

- Halocline, where a rapid

change in salinity exists

between 100 & 200 meters.

- Salinity increases because

water temperature

decreases.

Nature of SeawaterSalinity: Water & Salt

• Rivers & streams enter oceans along coastlines, providing

freshwater.

• Salinity can also change with depth.

Temperature of the Ocean: From

• Surface temperature varies by

• Deeper water is always colder than

surface waters.

• Remember: warm water is lighter

(less dense) & remains above

colder heavier (dense) water.

• A thermocline exists beneath the

surface of the ocean, where it

would feel like a sudden burst of

cold.

Nature of SeawaterTemperature of the Ocean: From Freezing to Warm

• Surface temperature varies by latitude & season

Nature of SeawaterTemperature of the Ocean: From

• Surface temperature varies by

• Light does not support

photosynthesis & plant growth

beyond 100 m.

• Beyond 200 m there is complete

darkness.

Light in Ocean Waters

• On average, light reaches to about 20 m below the surface of

the ocean.

MARINE

SCIENCE

Wednesday

21 Mar 2018

Entry TaskWhat conditions lead to hypersaline waters?

• High evaporation & low precipitation.

What is the transitional area called where there is a rapid

change in salinity? Where does it occur?

• Halocline

• Between 100 & 200 m

Agenda Housekeeping

Unit_03 Nature of Seawater

HousekeepingSummative assessment next Tuesday, 27 Mar.

• Unit_03 Nature of Seawater

• One 3x5 index card (front & back) will be allowed.

Early release schedule next week, Wednesday - Friday,

28-30 Mar.

• Sending out progress reports by the end of this week.

Nature of SeawaterDissolved Gases in Seawater

• Seawater contains dissolved gases

from mixing with air in the

atmosphere.

• Most common dissolved gases:

nitrogen, carbon dioxide, & oxygen.

• Both plants & animals are

responsible for removing &

replacing gases in seawater.

Nature of SeawaterDissolved Gases in Seawater

• Plants take in & release both

oxygen & carbon dioxide in

processes known as

photosynthesis & respiration.

• Animals undergo respiration

burning oxygen to release energy

from food & exhale carbon dioxide

Nature of SeawaterCO2: Buffering Seawater

• Extreme shifts in CO2

concentrations (acid or base)

could threaten or kill many

organisms.

• Constant chemical reactions in

seawater maintains a pH range

of 7.5 to 8.5 supporting marine

life.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Battery Acid

Gastric Acid

Hydrochloric Acid

Soda

Acid Rain

Black Coffee

Urine/Saliva

*Pure Water

Seawater

Baking Soda

Milk of Magnesium

Ammonia

Soapy Water

Bleach

Drain Cleaner

Acidic (Acid)

[H+] > [OH-]

Neutral

[H+] = [OH-]

Alkali (Base)

[H+] < [OH-]

Nature of SeawaterCO2: Buffering Seawater

• Essential to the buffering chemical reaction is carbon dioxide.

• Buffering maintains the necessary pH range.

- Without this buffering system, few marine animals could

survive changes in ocean pH.

Nature of SeawaterDesalination: A New Source of Freshwater

• Increases in world population & industry have endangered

freshwater supplies.

• Scientists have begun developing desalination methods to

process saltwater into freshwater, such as:

- Distillation

- Filtration

- Crystallization

http://www.roplant.org/contents.asp?Depth1=6&Depth2=1

Nature of SeawaterSummary

• Earth’s water is salty & through

evaporation & precipitation it is purified &

free of salt.

• Brackish water has low salinity, while

hypersaline has high salinity.

• Surface temperature varies & is warmer

at the equator than the poles.

• Deeper water is colder because the sun

warms the surface & a thermocline exists

where temperature drops rapidly.

https://www.vernier.com/products/sensors/temperature-sensors/gw-

temp/https://serc.carleton.edu/microbelife/extreme/hypersaline/index.html

Nature of SeawaterSummary

• Of the three most common dissolved gases,

CO2 is especially important because it

buffers the pH of seawater.

• Overuse & contamination has led to

shrinking freshwater supplies & so scientists

experiment with different desalination

methods.

https://www.wonderwhizkids.com/salty-oceans https://marlperezwork.weebly.com/-freshwater-pollution.html

MARINE

SCIENCE

Thursday

22 Mar 2018

Entry TaskWhat are the two processes that take out & replace dissolved

gases in seawater?

• photosynthesis & respiration.

What are the methods used by scientists for desalination?

• Distillation

• Filtration

• Crystallization

Agenda Housekeeping

Unit_03 Nature of Seawater

HousekeepingProgress reports going out tomorrow, 23 Mar.

Summative assessment next Tuesday, 27 Mar.

• Unit_03 Nature of Seawater

• One 3x5 index card (front & back) will be allowed.

Early release schedule next week, Wednesday - Friday,

28-30 Mar.

Nature of SeawaterSummary

• Earth’s water is salty & through

evaporation & precipitation it is purified &

free of salt.

• Brackish water has low salinity, while

hypersaline has high salinity.

• Surface temperature varies & is warmer

at the equator than the poles.

• Deeper water is colder because the sun

warms the surface & a thermocline exists

where temperature drops rapidly.

https://www.vernier.com/products/sensors/temperature-sensors/gw-

temp/https://serc.carleton.edu/microbelife/extreme/hypersaline/index.html

Nature of SeawaterSummary

• Of the three most common dissolved gases,

CO2 is especially important because it

buffers the pH of seawater.

• Overuse & contamination has led to

shrinking freshwater supplies & so scientists

experiment with different desalination

methods.

https://www.wonderwhizkids.com/salty-oceans https://marlperezwork.weebly.com/-freshwater-pollution.html

Formative AssessmentGrab a ChromeBook from the cart.

• Be sure to grab the number that corresponds to the number

on your desk.

Log into goggle classroom & complete the formative

assessment “Unit_03 Nature of Seawater Formative

Assessment 1” on your own.

• No notes

• This will not affect your grade, it is a measure of what you

currently know about the Nature of Seawater.

• This will inform you & I about what areas we need to focus on

before the summative assessment.

Hold onto your ChromeBooks for next assignments.

Nature of SeawaterUnit_03 Nature of Seawater Practice #3

• Complete both sides of the worksheet.

• Information will be on the summative assessment.

Note: The “Unit_03 Nature of Seawater Practice 3” worksheet

can be located on the Biology webpage @ link:

https://www.steilacoom.k12.wa.us/Page/6601

Nature of SeawaterKahoot study question development.

• Grab a separate sheet of paper that can be turned in.

• Construct 5 multiple choice questions from your assigned

section of reading.

- Even # = Introduction (p. 61) - Differences in Salinity (p. 65)

- Odd # = Temperature (p. 65) - Summary (p. 68)

• Must include 4 answers; one correct & 3 reasonable, but

incorrect

• This is a scored assignment.

MARINE

SCIENCE

Friday

23 Mar 2018

Entry TaskGrab a copy of the “Unit_03 Nature of Seawater Lab Activity #1”

worksheet from the front counter.

• Read through the lab activity.

Agenda Housekeeping

Unit_03 Nature of Seawater

HousekeepingProgress reports going out tonight.

Summative assessment next Tuesday, 27 Mar.

• Unit_03 Nature of Seawater

• One 3x5 index card (front & back) will be allowed.

Early release schedule next week, Wednesday - Friday,

28-30 Mar.

Nature of Seawater“Unit_03 Nature of Seawater Lab Activity #1”

• Read through the lab activity.

• Work with your team to collect all required data & record data

within your worksheet.

• Answer the analysis questions.

• When complete, turn in lab activity worksheet & complete

Kahoot review questions.

Note: The “Unit_03 Nature of Seawater Lab Activity 1”

worksheet can be located on the Biology webpage @ link:

https://www.steilacoom.k12.wa.us/Page/6601

Nature of SeawaterKahoot study question development.

• Grab a separate sheet of paper that can be turned in.

• Construct 5 multiple choice questions from your assigned

section of reading.

- Even # = Introduction (p. 61) - Differences in Salinity (p. 65)

- Odd # = Temperature (p. 65) - Summary (p. 68)

• Must include 4 answers; one correct & 3 reasonable, but

incorrect

• This is a scored assignment.

Nature of SeawaterUnit_03 Nature of Seawater Practice #4

• Complete both sides of the worksheet.

• Information will be on the summative assessment.

Note: The “Unit_03 Nature of Seawater Practice 4” worksheet

can be located on the Biology webpage @ link:

https://www.steilacoom.k12.wa.us/Page/6601