Objectives/Goals
I wanted to find out which soil is the safest to
build a structure on in the earthquake-prone area of San Francisco Bay.
Methods/Materials
I took two clear plastic cups and cut off the
bottoms. I placed them upside down in the middle of a pie plate. I then filled
one cup with sand and one with clay soil, with a one ounce sinker on top of
each. I filled the plate with 40 mls. of water and waited 90 seconds. I then
tapped the cup six times within three seconds.
Results
With the cup of sand, the water saturated it within
90 seconds and the sinker had completely disappeared before I tapped the cup.
With the clay, the sinker did not move and the clay did not liquefy.
Conclusions/Discussion
I concluded that clay is MUCH safer to build on than
sand in an earthquake area. I wanted to find out which of two types of soil in
the S.F. Bay Area was safer in an earthquake.
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