2
SUGGESTED
APPROACH
ACTIVITY A
The investigation can be used in either an individualized
format with each student having access to the necessary labora-
tory materials,
or in a group laboratory with pre-lab and
post-
lab discussions. In the latter case,
the student guide will
have to be redesigned by pulling out the questions and duplicating
them separately.
The text information should be presented during
the pre-lab or post-lab discussion.
If used in an individualized format, each pair of students
should have available the set of rocks, since these are the most
heavily used materials.
One or two jars with sediment, and 4
or 5 microscope-and-salt-solution set-ups should be available at
stations placed around the classroom.
The investigation could be preceded by the film Rocks that
Form on the Surface,
available from Encyclopedia Britannica
Educational Corporation.
The film describes sedimentary rocks,
where they come from, what they are composed of, and how they are
formed. It is 16 min. long.
You might want to use this investigation as an introduction
to a unit on Ohio's energy supply.
There is a great deal of
concern about full exploitation of natural gas in Ohio.
Ohio's
coal has a great deal of sulfur in it which adds to pollution.
Therefore,there is a problem in its use.
The two methods now
being used to reduce sulfur in coal are stack scrubbers and
fluidized-bed boilers. Both use limestone to remove the sulfur.
In this activity students examine and describe the
sedimentary rocks found in Ohio.
common
Keywords:
Shale, sandstone, limestone, dolostone,
oil,
gas,
coal,
salt, gypsum,fragmental rock, organic rock,
chemical rock.
1.
Students should note that the fragments of rock in the jar
settle out according to size.
The sand settles first in
a layer on the bottom and the clay settles last forming a
layer on top.
2-3.
The descriptions that students write of the types of rocks
should be similar to those in the student guide but in
their own words.
4.
Note that no distinction is made in the activity between
limestone and dolostone.
If you want, you can provide some