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Detail of the Cretaceous-Paleogene (K-T) boundary in Zumaia (Spain). The boundary zone is about 5 cm thick and contains nickel-rich spinels, microcrystals, soot and a significant iridium anomaly.
Wall texture with bricks on the edges
Businesswoman sitting at desk uses strong body language to halt unwanted advance from male colleague with coffee cup, illustrating workplace dynamics, conflict, and harassment prevention.
Diomede islands, maritime boundary between Russia, Chukotka district and USA, Alaska, the middle of Bering Straite
Concrete Stop, Limitations of Ownership of Land concrete stakes, planted in the field, as a marker, boundary between fields, land ownership boundaries, yard, rice field

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