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A country has a trade surplus when
Cross Beds
Layers of rock that are inclined relative to the horizontal surface, typically formed by wind or water currents.
Fossils
The preserved remains, impressions, or traces of once-living organisms from a past geological age, embedded and preserved in sedimentary rocks.
Marine Layers
Strata of moist ocean air that is cooled below its dew point temperature and thus forms a layer of clouds at the surface or near the surface of a large body of water.
Sand Dunes
Hills or ridges of sand piled up by the wind in desert regions or near bodies of water.
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