A high, often breaking wave generated by a tide crest that advances rapidly up an estuary or river.

A high, often breaking wave generated by a tide crest that advances rapidly up an estuary or river.

• A. Tidal Bore
• B. Tidal Current
• C. Perigee
• D. Neap Tide

Answer: (A)

A tidal bore is a high, often breaking wave that forms when the leading edge of the rising tide moves upriver into an estuary or narrow, funnel-shaped channel, increasing in steepness as it travels upstream. The combination of a large tidal range and the narrowing of the channel causes the incoming tide to amplify into a distinct, fast-moving wave that can push far upstream and sometimes break against the riverbanks. This directly matches the description of a high wave generated by a tide crest that advances rapidly up an estuary or river. In contrast, a tidal current refers to the general flow of water driven by tides rather than a single large wave moving upstream. Perigee is an orbital position of the Moon (closest to Earth) that can influence tides overall but does not describe a breaking wave advancing up a river. A neap tide describes a condition of reduced tidal range, not a propagating breaker up an estuary.

A tidal bore is a high, often breaking wave that forms when the leading edge of the rising tide moves upriver into an estuary or narrow, funnel-shaped channel, increasing in steepness as it travels upstream. The combination of a large tidal range and the narrowing of the channel causes the incoming tide to amplify into a distinct, fast-moving wave that can push far upstream and sometimes break against the riverbanks. This directly matches the description of a high wave generated by a tide crest that advances rapidly up an estuary or river.

In contrast, a tidal current refers to the general flow of water driven by tides rather than a single large wave moving upstream. Perigee is an orbital position of the Moon (closest to Earth) that can influence tides overall but does not describe a breaking wave advancing up a river. A neap tide describes a condition of reduced tidal range, not a propagating breaker up an estuary.