What's the main difference between "sea", "ocean" and "marine"?
Native speaker’s answer
Rebecca
"Sea" and "ocean" are fairly similar. They both are huge bodies of saltwater, but a "sea" is smaller than an "ocean." Seas are also partially surrounded by land, whereas an ocean is not. "Marine" is anything related to sea or sea transportation. Ex: There are five oceans: the Atlantic, the Pacific, the Indian, the Antarctic, and the Arctic. Ex: The storm made the sea waters dangerous. Ex: Marine ecosystems are home to a variety of animals and organisms.