Materials: Large Beaker; small jar; rubber band; Hot water; cold water; ice; food coloring; paper punch dots.
Procedure: 1. Fill the large beaker about half full with cold tap water. 2. Partly fill the small jar with hot tap water and stir in 6 drops of food coloring. 3. Carefully add enough hot water to fill the jar to the brim. 4. Cover the top of the jar with aluminum foil and secure with a rubber band. 5. Carefully lower the jar into the beaker of cold water. 6. Add several pieces of ice to the beaker. 7. Place the pieces of paper on the surface of the water. 8. IYSL Draw a picture predicting what will happen to the colored water and to the pieces of paper floating on the surface. 9. Without disturbing the water, use the tip of the pencil to make two small holes about 2 mm in diameter in the aluminum foil covering the jar. 10. Observe the contents of the jar as well as the paper pieces on the surface of the water. 11. IYSL Draw what actually happens to the colored water and to the pieces of paper floating on the surface
Question: How does Earth’s core affect convection currents in the asthenosphere?
Discuss your results with your lab partner. Understanding the processes and why they occurred.
Background: The liquid outer core and the upper mantle that behaves as a solid for seismic wave propagation and as a very viscous fluid for long duration geologic processes including convection. The heat that causes convection within the Earth comes from two sources – original heat from accretion and heat released during radioactive decay of unstable isotopes. Although the Earth is about 4.5 billion years old, some heat remains from the accretionary process during its formation because fragments of Earth materials were heated to very high temperatures by impact during formation of the planet, and Earth materials have relatively low thermal conductivity so that significant heat has been retained from the early stages of Earth history. A more important source of heat, however, is the natural, spontaneous, radioactive decay of unstable isotopes of elements that are distributed throughout the Earth, particularly in the crust and mantle. These radioactive elements include Uranium, Thorium and Rubidium. These sources of heat cause the Earth's temperature to increase with depth to a temperature of about 5000°C in the inner core.
Hypothesis: IYSL Write a hypothesis that answers the investigative question.
What Drives the Plates? Part II 1. Fill the large beaker ...
The heat that causes convection within the Earth comes from two sources â original heat from accretion and heat released during radioactive decay of unstable ...
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Matthew J. Berg, Christopher M. Sorensen,* and Amitabha Chakrabarti. Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601, USA.
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