| 11. | They dig burrows in sandy or muddy seabed and eat zooplankton.
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| 12. | The exercises started with the clearance of mines on the seabed.
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| 13. | These marine animals are found in shallow water on the seabed.
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| 14. | It lies beneath the surface, rising from the surrounding seabed.
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| 15. | The submarine developed a severe list and sank to the seabed.
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| 16. | Sand mining from both beaches and the seabed has encountered opposition.
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| 17. | Very little life could tolerate the stagnant conditions on the seabed.
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| 18. | The kingdom was first built with hardwood on the soft seabed.
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| 19. | The seabed descends in places only a few centimetres per kilometre.
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| 20. | After some time these settle on the seabed and undergo metamorphosis.
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