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The sun, which drives the water cycle, heats water in oceans and seas. Water evaporates as water vapor into the air. Some ice and snow sublimates directly into water vapor. Evapotranspiration is water transpired from plants and evaporated from the soil. The water molecule H 2O has smaller molecular mass than the major components of the atmosphere, nitrogen and oxygen, N 2 and O 2, hence is less dense. Due to the significant difference in density, buoyancy drives humid air higher. As altitude increases, air pressure decreases and the temperature drops (see Gas laws). The lower temperature causes water vapor to condense into tiny liquid water droplets which are heavier than the air, and fall unless supported by an updraft. A huge concentration of these droplets over a large space up in the atmosphere become visible as cloud. Some condensation is near ground level, and called fog. Atmospheric circulation moves water vapor around the globe; cloud particles collide, grow, and fall out of the upper atmospheric layers as precipitation. Some precipitation falls as snow or hail, sleet, and can accumulate as ice caps and glaciers, which can store frozen water for thousands of years. Most water falls back into the oceans or onto land as rain, where the water flows over the ground as surface runoff. A portion of runoff enters rivers in valleys in the landscape, with streamflow moving water towards the oceans. Runoff and water emerging from the ground (groundwater) may be stored as freshwater in lakes. Not all runoff flows into rivers; much of it soaks into the ground as infiltration. Some water infiltrates deep into the ground and replenishes aquifers, which can store freshwater for long periods of time. Some infiltration stays close to the land surface and can seep back into surface-water bodies (and the ocean) as groundwater discharge. Some groundwater finds openings in the land surface and comes out as freshwater springs. In river valleys and floodplains, there is often continuous water exchange between surface water and ground water in the hyporheic zone. Over time, the water returns to the ocean, to continue the water cycle.

INTO JAPANESE

水循環を促進する太陽は、海や海の水を加熱します。水は水蒸気として空気中に蒸発します。一部の氷と雪は直接水蒸気に昇華します。蒸発散量は、植物から蒸散し、土壌から蒸発する水です。水分子H 2Oは、大気の主成分よりも分子量が小さく、

BACK INTO ENGLISH

The sun, which promotes the water cycle, heats the ocean and the water of the ocean. Water evaporates into the air as water vapor. Some ice and snow sublimate directly into water vapor. Evapotranspiration is the water that evaporates from plants and evaporates from the soil. Water molecule H 2O has a smaller molecular weight than the main component of the atmosphere,

INTO JAPANESE

水循環を促進する太陽は、海と海の水を加熱します。水は水蒸気として空気中に蒸発します。一部の氷と雪は直接水蒸気に昇華します。蒸発散量は、植物から蒸発し、土壌から蒸発する水です。水分子H 2Oの分子量は主要成分よりも小さい

BACK INTO ENGLISH

The sun, which promotes the water cycle, heats the ocean and its water. Water evaporates into the air as water vapor. Some ice and snow sublimate directly into water vapor. Evapotranspiration is the water that evaporates from plants and from the soil. Water molecule H 2O molecular weight is smaller than the main component

INTO JAPANESE

水循環を促進する太陽は、海とその水を加熱します。水は水蒸気として空気中に蒸発します。一部の氷と雪は直接水蒸気に昇華します。蒸発散量は、植物や土壌から蒸発する水です。水分子H 20分子量は主成分よりも小さい

BACK INTO ENGLISH

The sun, which promotes the water cycle, heats the ocean and its water. Water evaporates into the air as water vapor. Some ice and snow sublimate directly into water vapor. Evapotranspiration is the water that evaporates from plants and soil. Water molecule H 20 molecular weight is smaller than the main component

INTO JAPANESE

水循環を促進する太陽は、海とその水を加熱します。水は水蒸気として空気中に蒸発します。一部の氷と雪は直接水蒸気に昇華します。蒸発散量は、植物や土壌から蒸発する水です。水分子H 20分子量は主成分よりも小さい

BACK INTO ENGLISH

The sun, which promotes the water cycle, heats the ocean and its water. Water evaporates into the air as water vapor. Some ice and snow sublimate directly into water vapor. Evapotranspiration is the water that evaporates from plants and soil. Water molecule H 20 molecular weight is smaller than the main component