week 3 relative density and convection objective: –to become familiar with the effects of relative...
TRANSCRIPT
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
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?
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
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: