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Oceanography index: the index to this large section. About the oceans: size, surface, origin, evolution, Ocean properties: temperature, seasons, density, Waves: how waves work, propagate, break,  2 Special waves: tsunamis, internal waves, bores, Tides: how the tide works, not as many think Circulation: ocean currents, winds, climate 2 Dunes & beaches: how beaches and dunes form Why and how we are losing our beaches: stupidity? Storms: hurricanes, cyclones and their forces Cyclone Heta: how it destroyed Niue. Survivors? Why NZ is so special: know what to value Composition of sea water: elements for life, gases Mining sea sand: why, how and sustainability Acidic oceans: are oceans in peril? a new scare? Habitats in the sea: an introduction The intertidal rocky shore: principles and examples. Soil: how it is made, maintained and lost. Degradation: the new threat to the sea. Marine conservation: wishful thinking? Marine reserves: do they work as expected? Biodiversity: what is it and how different is the sea?