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What Trickles Down?
Source Institutions
Learners design their own experiment to explore the permeability of different materials such as soil, sand, gravel, and marbles.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-910.jpg?itok=YWyy9oim)
How Fast Can a Carrot Rot?
Source Institutions
Learners design their own experiment to determine conditions that either help or hinder the decomposition of carrots by soil microbes.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-905.jpg?itok=FofB2CXb)
Map That Habitat
Source Institutions
Historically, sea floor mapping (bathymetry) was done by soundings.
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Sliding and Stuttering
Source Institutions
Learners use a spring scale to drag an object such as a ceramic coffee cup along a table top or the floor.
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Wet Pennies
Source Institutions
Learners initially test to see how many drops of liquid (water, rubbing alcohol, and vegetable oil) can fit on a penny.