🔍 Key Concepts

• Wind force scales used in marine navigation and forecasting • How mariners historically estimated wind speed before electronic instruments • Recognizing names that are actually used in seamanship and weather reports

💭 Think About

• Ask yourself: which of these terms have you seen on marine weather forecasts, pilot charts, or in navigation textbooks? • Think about which option refers specifically to a standardized scale for wind force at sea, not just a general scientific or measurement term. • Consider which names sound like official meteorological terminology versus generic or made‑up terms.

✅ Before You Answer

• Identify which option is a well‑known, numbered wind force scale used by mariners. • Eliminate choices that describe units or systems of length/measurement rather than wind strength. • Watch for terms that are real science concepts (like Earth’s rotation effects) but are not used as a step‑by‑step wind speed scale.