Study
a Dreaming story, then create one of your own. Does it relate to
a prominent landmark in your area? What significance does this landmark
have to the local community?
A
topographic map shows mountains and valleys. People who know how
to read these maps can tell by looking at one how steep a certain
hill may be. They can plan the easiest place to cross a mountain
or hill. This project will help you understand how to read a topo
map.
Make
a topographic map with contour lines:
Materials:
- lump
of clay twice as big as your fist
- 2
sticks: 3 inches (7.6 cm) long
- cardboard,
12X12 inches (31X31 cm)
- ruler
- wire
coat hanger
- white
paper: 2 foot (61 cm)
- pencil
- piece
of dental floss
Procedure:
- Make
a fist size mountain out of a lump of clay. Place it on the cardboard.
- Straighten
the coat hanger, and then use one end to poke two holes straight
down through the center of the mountain all the way to the cardboard
base.
- Tie
each end of the dental floss to one of the short sticks and stretch
the dental floss taut. Hold each stick and, using the floss, cut
horizontally across the mountain, one-inch (2.5-cm)
down from the top.
- Remove
this clay slice and place it on the paper. Using the pencil, carefully
trace around the clay. Using the pencil, push through one of the
coat hanger holes and mark the paper. Mark the second hole in
this same manner so those two dots are in the middle of your first
tracing. Put this first clay piece aside to save for later.
- Cut
a second slice, 1 inch (2.5 cm) down from the first. Lay the second
slice over the first tracing, making sure the holes line up with
the first set. (You can use the coat hanger for this, scratching
the surface to make sure your second set of holes lines up with
the first). Trace around the second slice. Your tracing will form
a circle enclosing the first.
- Cut
as many more slices as you can, cutting each piece 1-inch horizontally
down from the top of the clay. Be sure to line up the holes each
time and trace each new section you cut. Your end tracing will
be of several rings outlining the first, with a pair of holes
in the center of the circles.
- Stack
the clay sections on top of each other to recreate the original
mountain. Be sure the holes line up.
Analyze:
Compare the topographic
map you have made to the model mountain. Why are some of the traced
lines closer together than others? What kind of slope gives you
lines that are close together? What kind gives lines that are farther
apart? On your topographic map, where are the steepest slopes? Where
would be the best place to plan a trail to the top of the mountain?
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