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Science · Earth sciences
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16. Why is the (a) because it usually contains a variety of minerals (b) because it is relatively (c) because it is not bioturbated (d) because source beds are usually nearby (e) because the sand grains are quite angular beach sand in the shoreface often an excellent reservoir 17. What is one occurrence location for tidal deltas? (a) where tides are highest (b) where tides are lowest (c) where tides occur twice a day (d) at breaks in a barrier island (e) where tides occur only once a day 18. Barrier islands are formed by (a) large storms (b) vegetation fixing blowing sand (c) rivers carrying sand to the sea (d) offshore drift (e) longshore drift 19. When a regression occurs the shoreface will move (a) along shore (b) landward (c) seaward (d) towards the prevailing wind (e) none of the above 20. In a delia where deposition is controlled by tidal curents, the sand bodies are aligned... (a) to the Earths rotational axis (b) perpendicular to the tidal currents (c) by the Sun and the Moon (d) to the Earths magnetic axis (e) parallel to the tidal current flow directions 21. The structure of delas is controlled by different curent generating agents Thene are... (a) waning currents (b) waxing currents (c) stream/river flows, waves, and tides (d) density overturn
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