Final answer:
Winds, ocean currents, and the hydrologic cycle result from solar energy and gravity. Heat from the Sun causes water to evaporate, which then condenses and falls back to Earth. Gravity also causes water to flow on land and into rivers and streams.
Step-by-step explanation:
The winds, ocean currents, and hydrologic cycle result from solar energy and the eternal heat engine. Heat from the Sun causes water to evaporate from the surfaces of the oceans, lakes, and land, forming water vapor in the atmosphere. When this vapor cools, it condenses and gravity causes the droplets to fall back to Earth as rain or snow. Gravity also plays a role in the movement of water on land, as it causes water to sink into the soil and flow into streams and rivers.