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PhosphateRockUSGOV.jpg

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PhosphateRockUSGOV.jpg(600 × 450 pixels, file size: 50 KB, MIME type: image/jpeg)

Phosphate rock

Source: http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/photogallery/ ; English Wikipedia, original upload 3 August 2004 by

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USGS logo


2004 Obverse Proof

This image has currency in it to indicate scale.

Do not use objects such as coins for scale, as they will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins are particularly bad as they can reinforce a geographical bias, and some coins' designs are not free content.

Please photograph a ruler with the subject or add a scale marking via an image editor instead. SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of good practice: with (metric & imperial) ruler and with superimposed line.
Examples of bad practice: here.

Metre rubant


Common coin diameters for reference:

  • U.S. dollar:
    • : 19 mm, 0.75 in
    • : 20 mm, 0.79 in
    • 10¢: 18 mm, 0.71 in
    • 25¢: 24 mm, 0.95 in
    • 50¢: 31 mm, 1.21 in
    • $1: 26 mm, 1.02 in
  • Canadian dollar:
    • : 19 mm, 0.75 in
    • : 21 mm, 0.83 in
    • 10¢: 18 mm, 0.71 in
    • 25¢: 24 mm, 0.94 in
    • 50¢: 27 mm, 1.07 in
    • $1: 26 mm, 1.04 in
    • $2: 28 mm, 1.10 in
  • Pound sterling
    • 1p: 20.32 mm, 0.80 in
    • 2p: 25.91 mm, 1.02 in
    • 5p: 18.00 mm, 0.71 in
    • 10p: 24.50 mm, 0.96 in
    • 20p: 21.40 mm, 0.84 in
    • 50p: 27.30 mm, 1.07 in
    • £1: 22.50 mm, 0.89 in
    • £2: 28.40 mm, 1.12 in
  • Euro
    • 1c: 16.25 mm, 0.64 in
    • 2c: 18.75 mm, 0.74 in
    • 5c: 21.25 mm, 0.84 in
    • 10c: 19.75 mm, 0.78 in
    • 20c: 22.25 mm, 0.88 in
    • 50c: 24.25 mm, 0.95 in
    • €1: 23.25 mm, 0.92 in
    • €2: 25.75 mm, 1.01 in

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This page uses content from the Wikimedia Commons. The original content was at File:PhosphateRockUSGOV.jpg. The list of authors can be seen in the page history. As with this Psychology Wiki wiki, that portion of the content of Wikimedia Commons is available under the GNU Free Documentation License.

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File history

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Date/TimeThumbnailDimensionsUserComment
current14:26, November 4, 2007Thumbnail for version as of 14:26, November 4, 2007600 × 450 (50 KB)PhloxBot (Talk | contribs)Phosphate rock Source: http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/photogallery/ ; English Wikipedia, original upload 3 August 2004 by {{PD-USGov-Interior-USGS-Minerals}} {{NoCoins}} Category:Phosphates Category:Rocks [[en:

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