The Water Cycle（水の循環）に関する語彙と表現について、The Water Cycle, Fastforward Lv12, NELSON CENGAGE Learning (2007), から気づいた点や、なるほどと思った点など、いくつかの表現を抜粋してみます。
The Water Cycle
*参考文献を元に図を作成
●導入
The process by which water moves from Earth to the sky and then back to Earth is called the water cycle.
●この過程における水の状態（液体・気体・固体）
During the water cycle, water takes three different forms:
・Liquid
・Gas
・Solid
※列挙するときは : を使う。
water takes three different forms
動詞は take を使い、３つの状態は three different forms を使う。
liquid (液体), gas (気体), solid (固体)
●３つの状態のそれぞれの呼称
The liquid form of water is rain, rivers, lakes and the ocean.
As a gas, water is called vapour.
As a solid, water is called ice, snow and hail.
vapur ... gas or extremely small drops of liquid that result from the heating of a liquid or solid
hail ... small balls of ice that fall like rain
●The Water Cycle の各段階
There are four stages in the water cycle:
1.evaporation
2.condensation
3.precipitation
4.runoff
※runoffの過程は今回作成した図には水が集まって川を形成し湖または海に流れるという図を作るのが面倒なので含めませんでした。
●１から３までの各段階
The first/second/third stage of (something) is (something)
※各段階に固有の名称がある場合に
The first stage of the water cycle is evaporation.
The second stage of the water cycle is condensation.
The third stage of the water cycle is precipitation.
●各段階の説明
Evaporation is when water changes from a liquid into a gas called vapour.
As clouds cool, condensation changes water from a gas to little drops of water.
Precipitation is when the liquid in the sky falls to Earth.
●その過程における水を表す単位
drops of water
little drops of water
●最後にこの過程は循環するという一文
The process then begins all over again.
もし the water cycle に関するお題が出されたときは、上記を用いて自分の言葉で説明できればいいなと思っています。