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Week 3 Relative density and convection Objective: –to become familiar with the effects of relative...

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Week 3 Week 3 Relative density and Relative density and convection convection Objective: to become familiar with the effects of relative density on convection to recognize how convection influences ocean circulation to measure temperature and salinity in seawater
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Week 3Week 3Relative density and convectionRelative density and convectionWeek 3Week 3Relative density and convectionRelative density and convection

Objective: – to become familiar with the effects of relative density

on convection– to recognize how convection influences ocean

circulation– to measure temperature and salinity in seawater

Focus questionsto be discussed after experiments are completedFocus questionsto be discussed after experiments are completed

What is density?

What is convection?

What is the relationship between relative density and convection?

Which earth materials (air, water, rocks) convect?

How does convection influence weather? Ocean circulation? Earth’s crust and mantle?

What happens to the process of convection under low gravity conditions (for example inside the space shuttle in space)? Why?

DensityDensityMass per unit Volume– Determined by temperature and salinity– Density of seawater increases all the

way to its freezing point of -1.9 º C

Your jobYour jobYour jobYour job

Work in teamsWork though the experimentsKeep accurate lab notesParticipate in small group discussion

and large group presentation

Hot plate

Heat water to 40oC

ice

Cool water to 5oC

Add food coloring to hot water

using dropper, carefully add colored hot water to cold water

observe layering

record data

Experiment 1

fresh water salt water

gently and carefully transfer salt water

use a dropper or pour

observe layers

record data

measure salinity using the refractometer

add food coloring to salt water

Experiment 2

Hot plate

Heat salt water to 40oC

ice

Cool fresh water to 5oC Add food

coloring to hot salt water

using dropper, carefully add colored hot water to cold water

observe layering

record data

Experiment 3

Experiment 4

red food color blue food color

50oC 0oC

Record observations

Focus questionsto be discussed after experiments are completedFocus questionsto be discussed after experiments are completed

What is density?

What is convection?

What is the relationship between relative density and convection?

Which earth materials (air, water, rocks) convect?

How does convection influence weather? Ocean circulation? Earth’s crust and mantle?

What happens to the process of convection under low gravity conditions (for example inside the space shuttle in space)? Why?

Science magazine July 2005

What is THERMOHALINE circulation?

Preparation for field tripsPreparation for field tripsPreparation for field tripsPreparation for field trips

Next week during lab time:– San Diego River channel

Carpools!

Reminder: Lab Quiz March 7

Logistics San Diego River tripLogistics San Diego River tripLogistics San Diego River tripLogistics San Diego River trip

Bring – Note book and pen– Jacket or sweatshirt– Sturdy walking shoes

Meet in ST 175 promptly at 2:30

San Diego River field tripSan Diego River field trip

12345

http://terraserver.microsoft.com/

San Diego River

Pacific Ocean

What are two sources of water in the river channel? Which is denser?

Which direction is the water flowing on a rising tide? Ebbing tide?

Is ocean water likely to flow underneath or on top of river water? Why?

How might differences in salinity and temperature influence the ability of plants and animals to live in the river habitat?

Questions to think about for next week:


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