50.7 MB (3.4 MB compressed)
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42.9 x 29.7 cm ⏐ 16.9 x 11.7 in (300dpi)
QA INTERNATIONAL / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY QA INTERNATIONAL / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
The Earth is formed of three concentric layers: the core, the mantle and the crust, these are separated by transition zones called discontinuities.
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