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          MATERIALS, SURFACE & SYSTEMS, continued
    World Geophysical Relief Map
View the whole world at once with this brilliantly colored, raised-relief map. This wall-size, three-dimensional map features land elevations and color keys to terrain, vegetation and ocean areas. Includes scales, time zones, ocean features and depths, national capitals and city populations. Printed on write-on/wipe-off, vacuum-formed vinyl. 38" × 20".
Map Reading Activity
Students learn the fundamentals of map reading—symbols, scale, direction, latitude and longitude and elevation—with this stim- ulating activity and relate them to real-life features. Use the three-dimensional terrain model, wall chart and two sets of five trans- parent plastic elevation sheets to teach map contours. Includes pad of 50 student maps, marking pencil and study guide outlining demonstrations, exercises and projects.
AP5094 I $85.95
AP5157 I $37.15
    Ocean Floor Topography Map
Give students a different perspective of
our world with this unique Mercator projec- tion map! Detailed topography is the most accurate in print—developed by combining all available depth soundings collected from NOAA satellite technology and radar altimeters. Features spreading ridges, trans- form faults, trenches and the distribution
of off-ridge volcanoes. Ideal for the study
of plate tectonics, geodynamics and ocean circulation. Size 53" × 34".
AP5226 I $45.00
Ocean Current—Demonstration Model
An easy-to-use activity model that demonstrates the effects of temperature and salinity on the circulation of water. First, observe the striking effect that water temperature has on ocean currents by placing cold blue water on one side of the model and hot red water on the other side. Then set up a saltwater concentration gradient to investigate ocean currents that arise when cold, dense saltwater sinks. Includes complete instruc- tions and detailed teacher notes.
AP7313 I $31.95
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