Is the sea a substance

The sea is not a substance in the traditional sense; rather, it is a large body of saltwater that contains various substances, including dissolved salts, minerals, and organic matter. It is composed of water, which is a chemical substance (H2O), but the sea itself is an ecosystem and environment rather than a singular substance. Additionally, the sea interacts with the atmosphere, land, and living organisms, making it a dynamic system rather than a static entity.