What is the name of the sea that is located between the Crimean Peninsula and the Caucasus?

Which sea is located between the Scandinavian Peninsula and the British Isles? What is the name of the sea that is located between the Korean Peninsula and the Japanese archipelago? Which ocean borders the western coast of South America? What is the name of the sea that is located between the Greek mainland and the island of Crete? Which ocean is home to the Mariana Trench? Which sea is located between the continents of Europe and Africa? Which ocean is home to the island of Madagascar? What is the largest island in the Mediterranean Sea?