Oct. 26 & 27 Welcome Assignment

1. Oct. 26 & 27Welcome 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 Title: Convection Currents/Density and our Ocean – Lab Activity

2. 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

3. Materials • 8 ice cubes (2 each trial) • Fresh warm water • Beaker tongs • A ruler • Thermometer • 250ml beaker • Salt (about 70 grams) • Spoon • Paper towels • Timer

4. 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.

5. 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)

7. Data/Observations