The line along which waters of different density converge, forming boundaries between major climate zones?

• A. Countercurrent
• B. Convergence Zone
• C. Caballing
• D. Current

Answer: (B)

When two water masses with different densities meet, they form a boundary where their properties differ and the flows come together. That line is known as a convergence zone. It marks where contrasting waters meet and interact, which helps establish the distinct characteristics of surrounding climate regions because density reflects temperature and salinity differences that drive circulation, heat transport, and atmospheric conditions over large areas.

The other ideas describe different things: a countercurrent is water moving in the opposite direction, a current is any moving body of water, and caballing is a mixing process that can change density but doesn’t describe a boundary line between climate zones.