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# Oct. 26 & 27 Welcome Assignment PowerPoint PPT Presentation

Oct. 26 & 27 Welcome Assignment. Extra Credit Word Search and Sudoku will not be accepted. The assignment is closed. Please take out your take home test and pass it forward. Take out a sheet of paper Write name, period, and date

Oct. 26 & 27 Welcome Assignment

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## Oct. 26 & 27Welcome Assignment

Extra Credit Word Search and Sudoku will not be accepted. The assignment is closed.

Take out a sheet of paper

Write name, period, and date

Title: Convection Currents/Density and our Ocean – Lab Activity

### Convection Current/Density in our Ocean Lab Activity

• Research Question/Purpose: How do convection and density affect our ocean waters? How does the salinity of the water affect the current?

• Background information:

• Convection = transfer of heat by a fluid (liquid or gas)

• Density = the amount of matter in a given space. mass/volume

### Materials

• 8 ice cubes (2 each trial)

• Fresh warm water

• Beaker tongs

• A ruler

• Thermometer

• 250ml beaker

• Spoon

• Paper towels

• Timer

### Procedure

• Obtain an ice cube that has been strongly dyed with food coloring

• Using the beaker tongs, gently place the ice cube in a beaker ¾ full of warm, fresh water. Keep the beaker and water as still as possible.

• Observe the ice – water mixture for 5 minutes. Write a detailed description of your observations

• Measure the temperature at the surface, at the bottom of the mixture, and 3 measured levels in between.

### Procedures continued…

• Empty the beaker and fill it to the same level with warm water.

• Add salt to the water, stirring vigorously as you pour until no more salt will dissolve (saturated solution)

• Repeat steps 3 and 4 using salt water in place of fresh water (do 2 trials of fresh water and 2 trails of salt water, first set for observations, second for temperature)