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# Warm up: - PowerPoint PPT Presentation

Warm up:. Which one of the fluids at the front of the room will flow the fastest? Which will flow the slowest? Honey, Chocolate syrup, or Applesauce? . Make a prediction at your table, thinking about an explanation behind your prediction. Viscosity.

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### Warm up:

Which one of the fluids at the front of the room will flow the fastest? Which will flow the slowest?

Honey, Chocolate syrup, or Applesauce?

• Measure of resistance for how well a fluid can flow. How “sticky” a fluid is.

More viscous = slower flowing

Less viscous = faster flowing

• A dixie cup with each of the following:

• Chocolate syrup

• Honey

• Applesauce

• A couple paper plates and plastic spoons

• First test the three unaltered substances: honey, chocolate syrup, and applesauce.

• Place a small blob of each on the edge of a paper plate, slowly elevate and watch to see what happens…

• Describe the fluids and their viscosity.

• If we wanted one of these fluids to flow faster or slower, what could we do to change it?

• Now you need to come up and get chocolate chips and some heated honey.

• The chocolate chips act as additional particulates such as silica that can be added to magma

• Compare heated honey to the unheated, and see how adding “silica” changes viscosity of the chocolate syrup

• Before you leave, write down on a piece of paper which viscosity magma you think leads to a more explosive eruption and why.

• Do volcanoes that erupt explosively have a high viscosity lava or a low viscosity lava? Why?

• In table groups, you will travel to each of the 8 stations. Four of these stations are:

• Shield volcanoes, stratovolcanoes, cinder cone volcanoes, and caldera volcanoes

• The other four stations can be match to one of these types

Anatomy of a volcano:Draw a cross-section of a volcano with these parts

• Crater: A steep-sided, usually circular depression formed by either explosion or collapse at a volcanic vent.

• Eruption Cloud: The column of gases, ash, and larger rock fragments rising from a crater or other vent.

• Magma Chamber: The subterranean cavity containing the magma which feeds a volcano.

• Pipe: A vertical conduit through the Earth's crust below a volcano, through which magma passes

• Plug: Solidified lava that fills the conduit of a volcano

• Vent: The opening at the earth's surface through which volcanic materials issue forth

• Dike: Formed when magma rises into an existing fracture or crack in the volcano, and then solidifies

• Fissures: Elongated fractures or cracks on the slopes of a volcano.