2.
While walking on the beach or reef flat, keep your eyes open for sedimentary
structures made by living things. Look for trails, tracks, burrows, holes or
mounds. Do you know what animals made these and how they were
produced? Make some pictures of the features you've seen.
3. While snorkelling over the reef flat or looking out from a "submarine" or
glass-bottomed boat, keep your eyes out for ripple marks on the bottom and
especially for ripples of moving sand. Look at the moving sand carefully and
notice how the ripples change. Make a sketch to show what you see.
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