The Roaring Forties are characterized by which atmospheric phenomenon?

• A. Wind
• B. Calms
• C. Rain
• D. Tsunamis

Answer: (A)

The main idea this item tests is the presence of strong, sustained winds in a specific region. The Roaring Forties are a belt in the Southern Hemisphere where the air moves from west to east with unusually high and steady speed. This happens because the global wind pattern—especially the strong mid-latitude westerlies—drives fast, persistent flow around the globe, and the vast, uninterrupted expanse of the Southern Ocean means there’s little land to slow or disrupt the wind. The result is consistently fierce winds that earn the name. Calms would be still air, which isn’t what this zone is known for; rain is a weather condition that can occur, but it isn’t the defining feature; tsunamis are seismic ocean waves, not atmospheric phenomena. So wind is the best description of what characterizes the Roaring Forties.