This week in earth systems, you'll learn a little bit more about how solar energy drives both atmospheric and oceanic circulation. In other words, the sun is what powers Earth's winds and the surface currents of the ocean. In this week's lessons, you'll become familiar with Earth's major wind systems. You'll also discover why the winds and ocean currents don't travel in a straight line. You'll learn how ocean currents affect climate, as well as what drives the movement of the ocean's deep water currents.