Unit 2.2- Ocean Topography and

Chemistry

Home Room Bell Work Oct 15

Agenda:1.Bell Work2.Pledge of Allegiance 3.Finish Bell Work4.New students in class5.Good Things6.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

Bell Work Oct 15

Agenda:1.Planner: Draw and label a plan for the Ocean Floor Paper Mache Diagram Project 2.Bell Work3.Did you Know?4.Notes5.Walk the Ocean Floor6.Homework

Bell Work:

•Read the “Did you Know” Fact Sheet

•Pick out 2 Facts that you found particularly interesting

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

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

Ocean Floor Diagram • Please draw and label in your notes

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

Home Room Bell Work Oct 16

Agenda:1.Bell Work2.Pledge of Allegiance 3.Finish Bell Work4.Good Things5.Lunch Count

Bell Work:

•With your partner, pick/revise your plan for the model

•Raise hand for plan approval

Bell Work Oct 16

Agenda:1.Bell Work2.Make Ocean Floor Model

Bell Work:

•Pick/revise a plan for your project

•Raise your hand to get approval

Home Room Bell Work Oct 17

Agenda:1.Bell Work2.Pledge of Allegiance 3.Good Things4.Lunch Count

Bell Work:

•Bring your project to your desk

Bell Work Oct 17

Agenda:1.Bell Work2.Graph Ocean Floor Model

Bell Work:

Home Room Bell Work Oct 20

Agenda:1.Bell Work2.Pledge of Allegiance 3.Good Things4.Lunch Count

Bell Work:

Bell Work Oct 20

Agenda:1.Planner: Take Home Lab Due Thurs

1. Salinity Variation Sheet Due Wed

2.Bell Work3.Notes4.Egg Lab

Bell Work:

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

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)

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?

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)

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

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