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The principal parts of sea power encompass several key elements that collectively define a nation's ability to project influence and sustain operations at sea. In this context, naval power plays a crucial role as it represents the military capabilities of a nation, including its navy's operational readiness, shipbuilding capacity, and technological advancements.

Ocean science is integral as it involves understanding and leveraging the ocean's dynamics, which can affect naval operations and facilitate advancements in maritime technology. Ocean industry pertains to the economic activities that occur at sea, such as fishing, shipping, and offshore energy production, all of which contribute to a nation's economic strength and, by extension, its maritime power. Ocean commerce is essential as it relates to the trade activities conducted over the sea, underpinning global trade networks and enhancing national economic resilience through the movement of goods and resources.

In summary, these elements work together to create a comprehensive understanding of sea power, highlighting how military strength, scientific knowledge, economic activities, and trade are interrelated components vital for a nation’s maritime strategy and influence.