A fold shaped like an elongate trough is a(n)____________.

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A syncline is a fold shaped like an elongate trough, where the youngest rock units are typically found in the center of the fold. Anticlines, on the other hand, are folds that have an arch-like shape, with the oldest rock units found in the center. Basins are simply areas of relatively lower elevation where sediment tends to accumulate, while domes are bulges in the earth's crust where rock layers have been pushed upward.

A Fold Shaped Like an Elongate Trough Is A(n)____________