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Nitrogen Cycle Poster
Learn the Cycles of the Atmosphere’s Most Abundant Gas
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Wind Vane Demonstrator, SCIENCE FIRST INC SE
Simple to operate and easy to use, this economical wind vane clearly provides current wind direction. Its heavy cast base and sturdy post support a sensitive cone bearing assembly that responds to even the slightest wind. Place the “N” portion of the wind vane in the northern position and read off the direction shown by the pointer.
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Ward's® Black Sand
1 pound of black sand packaged in a heat-sealed bag.
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Amazonite
Feldspar group; blue-green, microcline, triclinic, 3/4". Colorado.
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Gonioclymenia sp. (Devonian)
Highly polished ammonites showing fine sutures. Average size: 3 1/2 to 4" diameter. Morocco.
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Nautilus Pompilius Shell
This is the last surviving genus of an animal group with extensive fossil record.
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Dastilbe elongatus (Cretaceous)
Well preserved, bony fossil fish in matrix. Average length 11/2" on 2 x 3" matrix. Brazil.
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6" Diamond Cup Grinding Wheel
This replacement high-concentration diamond wheel is six inches in diameter.
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Traditional Indoor Weather Center
Attractive Display, Accurate Readings.