Why diatoms are called floating pastures on sea?

Diatoms are often referred to as "floating pastures of the sea" because they form vast blooms in ocean waters, serving as a primary food source for a variety of marine organisms. These microscopic, photosynthetic algae thrive in nutrient-rich waters and contribute significantly to the marine food web, akin to terrestrial pastures supporting livestock. Their abundance and role in carbon fixation also highlight their importance in marine ecosystems and global climate regulation.