We
discussed sand and where it comes from, what its made of, what colors
it can be, an how shape and size affect the texture. We watched
this video as an introduction. In Hawaii there are
black, red, and green sand beaches that have been deposited from the
weathering and erosion of volcanic rocks. In the Caribbean, you can
visit white and pink sand beaches from the weathering and erosion of
sand and coral.
Students
used scopes and made observations of sand samples from Hawaii, Grand
Cayman, Normandy France, Lake Anna, Lake Superior, California, and
Virginia Beach. Students determined what the sand was made of, where it
came from, how old it was, if it was on an active beach, a windy beach -
all kinds of information can be collected from a simple sample of sand!
Here are MsJ's toes on a black sand beach in Hawaii!
Today
the class was spent working independently on the seafloor features
surrounding the United States and reading and answering questions about
underwater vehicles. Submarines are larger than submersibles and carry
more people and can go longer distances. ROVs and AUVs are robots like
remote-controlled cars, but go underwater. ROV's have a tether (cord)
connecting them to power and AUVs do not.
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