Final answer:
Basalt contributes to the seawater and sea floor through the release of minerals and gases, the formation of new oceanic crust, and the provision of essential nutrients for marine organisms.
Step-by-step explanation:
Basalt contributes to the seawater and sea floor in several ways.
First, when basalt lava flows erupt on the seafloor, they release minerals and gases into the seawater.
These minerals and gases can affect the chemistry and composition of the seawater. Additionally, as the basalt lava cools and solidifies, it forms new oceanic crust, which adds to the thickness and structure of the sea floor.
Furthermore, basalt is rich in nutrients and minerals, which can support the growth of marine organisms. For example, basalt provides important elements like iron and magnesium that are necessary for the growth of phytoplankton, which form the base of the marine food chain.