附答案的兒童謎語與腦力激盪題

Worksheet 2: Stages of the water cycle

Name: ____________ Date: ________

A. Multiple choice (circle one)

1. When the sun heats water in a lake, the water turns into vapour. This is called… a) condensation b) evaporation c) precipitation d) collection
2. Clouds are made of… a) smoke b) water vapour only c) tiny water droplets or ice crystals d) cotton
3. Which of these is not precipitation? a) rain b) snow c) hail d) fog

B. True or false

4. Water evaporates only in summer. ______
5. Plants release water vapour through their leaves. ______
6. The same water has been moving around Earth for millions of years. ______

C. Matching

Word		Meaning
7. Condensation		A. Water falling from clouds
8. Precipitation		B. Water gathering in oceans, lakes and underground
9. Collection		C. Vapour cooling and turning into droplets

D. Fill in the blanks

10. Water vapour rises, ________ (cools / heats up) and forms clouds.
11. Water that soaks into the ground is called ________ water.

Answer key with explanations

#	Answer	Why
1	b	Evaporation means liquid becomes gas when heated
2	c	Vapour is invisible; we see clouds because it has already condensed into droplets
3	d	Fog is a cloud near the ground; nothing falls from it
4	False	Water evaporates all year, just more slowly when it's cold
5	True	This is called transpiration
6	True	Earth doesn't get new water; the same water keeps cycling
7–9	C, A, B	Order of the cycle: condense → fall → collect
10	cools	Cold air holds less vapour, so droplets form
11	ground	Groundwater feeds wells and springs

Teacher tip: before worksheet 2, show a cold glass "sweating" in a warm room. Pupils who saw it get question 7 right far more often.