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| Image | 1 | 2 | |
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| Sea-floor spreading Research on the ocean floor shows that the rocks there are often younger than those on land. To label, see p49. |
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| 2 Images | WWW.DK.COM | Generated by JAlbum 6.5 & Chameleon skin | Help | |
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| Image | 1 | 2 | |
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| Sea-floor spreading Research on the ocean floor shows that the rocks there are often younger than those on land. To label, see p49. |
|
| 2 Images | WWW.DK.COM | Generated by JAlbum 6.5 & Chameleon skin | Help | |