![A fish-eye view of the wake of a ship out at sea. Here's an ocean fact: The surface layer of the ocean is teeming with photosynthetic plankton. Though they're invisible to the naked eye, they produce more oxygen than the largest redwood trees. (Image credit: NOAA) A fish-eye view of the wake of a ship out at sea. Here's an ocean fact: The surface layer of the ocean is teeming with photosynthetic plankton. Though they're invisible to the naked eye, they produce more oxygen than the largest redwood trees.](/sites/default/files/styles/landscape_width_1275/public/legacy/image/2020/Jun/IMAGE--ocean-churn-061720--NOAA--1200x809.jpg?h=ee889385&itok=ReUXoCUu)
A fish-eye view of the wake of a ship out at sea. Here's an ocean fact: The surface layer of the ocean is teeming with photosynthetic plankton. Though they're invisible to the naked eye, they produce more oxygen than the largest redwood trees. (Image credit: NOAA)