https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:water-and-human-activities/xe25057200abc6bd6:ocean-systems-and-human-activity/v/the-world-ocean 2026-06-30T14:51:06.615103731Z The World Ocean Earth's World Ocean is connected by currents and gyres that form a global ocean conveyor belt, moving heat, nutrients, and water around the planet. This circulation shapes climate and supports ecosystems. Human activities, such as pollution and resource use, disrupt ocean systems and impact marine life worldwide. Wieteke Holthuijzen video https://cdn.kastatic.org/ka_thumbnails_cache/00ca6cda-7b2d-4ed3-9f2a-2e407e91e54e_1280_720_base.png The World Ocean Earth's World Ocean is connected by currents and gyres that form a global ocean conveyor belt, moving heat, nutrients, and water around the planet. This circulation shapes climate and supports ecosystems. Human activities, such as pollution and resource use, disrupt ocean systems and impact marine life worldwide. https://cdn.kastatic.org/ka-youtube-converted/ZplA8A-bbWo.mp4/ZplA8A-bbWo.mp4 326 Ocean systems and human activity https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:water-and-human-activities/xe25057200abc6bd6:ocean-systems-and-human-activity/a/the-world-ocean 2026-06-30T14:20:41.927190319Z Learn and try: The World Ocean Learn about the World Ocean, how water moves through the ocean system, and how marine organisms depend on one another to survive. article https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:water-and-human-activities/xe25057200abc6bd6:ocean-systems-and-human-activity/a/ocean-resources-and-human-activity 2026-06-30T14:20:41.927190319Z Learn and try: Ocean resources and human activity Learn about how people use and depend on ocean systems, how human activities impact the ocean, and what people can do to help protect it. article https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:water-and-human-activities/xe25057200abc6bd6:ocean-systems-and-human-activity/e/understand-ocean-systems-and-human-activity 2026-06-30T14:20:41.927190319Z Understand: Ocean systems and human activity Check your understanding of ocean systems and human activity in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:water-and-human-activities/xe25057200abc6bd6:ocean-systems-and-human-activity/e/apply-ocean-systems-and-human-activity 2026-06-30T14:20:41.927190319Z Apply: Ocean systems and human activity Apply your understanding of ocean systems and human activity in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise