一條簡單地理問題

evaporation -> condensation -> precipitation -> drainage (mainly rivers)

As you ask "how does water return from the land to the oceans?", in fact this is hard to determind as there are some lakes that the water will be locked in one place and the water cannot flow back to the oceans.

1.precipitation -->surface runoff and channel runoff-->flow to ocean
2.infiltration-->soil is saturated--> excess of soil water, underground waterflow-->flow to ocean
3.evaporation-->precipitation over sea

主要呢2個方法

1. 直接流番去

2. EVAPORATION

Earth is a truly unique in its abundance of water. Water is necessary to sustaining life on Earth, and helps tie together the Earth's lands, oceans, and atmosphere into an integrated system. Precipitation, evaporation, freezing and melting and condensation are all part of the hydrological cycle - a never-ending global process of water circulation from clouds to land, to the ocean, and back to the clouds. This cycling of water is intimately linked with energy exchanges among the atmosphere, ocean, and land that determine the Earth's climate and cause much of natural climate variability. The impacts of climate change and variability on the quality of human life occur primarily through changes in the water cycle. As stated in the National Research Council's report on Research Pathways for the Next Decade (NRC, 1999): "Water is at the heart of both the causes and effects of climate change."

經水循環
easy?

糸咪(貞)發或者經水道流回大海