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[Stockbild] Estuary sediment. Aerial photograph of the Deep Creek estuary, near Broome, Australia. Mangrove thickets (lower left) are outlined by yellow sand, which has been carried and deposited there by winds from the mainland. The grey silt that collects in the estuary has narrowed the river's path (green), allowing vegetation to colonise further from the river banks. (KEYSTONE/SCIENCE PHOTO LIBRARY/BERNHARD EDMAIER) === ===