Water & the water cycle

The water cycle describes how water moves continuously between the Earth's surface and the atmosphere. The sun heats water in oceans, rivers and lakes, causing evaporation (turning it into water vapour that rises). This vapour cools and condenses into clouds. When clouds get heavy enough, precipitation (rain, snow or hail) falls back to Earth, and the cycle continues.

Key terms

Evaporation:

Water turning into vapour and rising into the air.

Condensation:

Water vapour cooling and turning back into liquid droplets, forming clouds.

Precipitation:

Water falling from clouds as rain, snow or hail.

Questions

1. 1. Water turning into vapour and rising is called:

   • Evaporation
   • Condensation
   • Precipitation
   • Freezing

2. 2. Water vapour cooling into clouds is called:

   • Evaporation
   • Condensation
   • Precipitation
   • Melting

3. 3. Rain falling from clouds is called:

   • Evaporation
   • Condensation
   • Precipitation
   • Boiling

4. 4. What causes water to evaporate from oceans and rivers?

   • The sun's heat
   • The moon
   • Wind alone
   • Nothing, it happens randomly

5. 5. The water cycle is best described as:

   • Water moving continuously between Earth's surface and the atmosphere
   • Water disappearing forever
   • A one-time event
   • Only happening in winter

6. 6. Clouds are formed mainly through:

   • Condensation of water vapour
   • Evaporation of rocks
   • Precipitation only
   • Wind blowing dust

7. 7. A puddle disappearing on a sunny day is an example of:

   • Evaporation
   • Precipitation
   • Freezing
   • Nothing scientific

8. 8. Which type of precipitation falls in very cold conditions instead of rain?

   • Snow
   • Steam
   • Fog
   • Vapour

9. 9. Why does water vapour rise into the atmosphere?

   • It is heated and becomes lighter than the surrounding air
   • It is heavier than air
   • Gravity pulls it upward
   • It has no reason to rise

10. 10. Which of these is NOT a stage in the basic water cycle?

    • Evaporation
    • Condensation
    • Photosynthesis
    • Precipitation

11. 11. Rivers carrying rainwater back to the ocean is part of which process?

    • Collection / runoff
    • Evaporation
    • Condensation
    • Photosynthesis

12. 12. Why is the water cycle important for life on Earth?

    • It moves fresh water to where plants, animals and people need it
    • It has no importance
    • It only affects the ocean
    • It stops all rain forever

13. 13. On a cold glass of lemonade, water droplets forming on the outside are an example of:

    • Condensation
    • Evaporation
    • Precipitation
    • Erosion

14. 14. Which statement about the water cycle is TRUE?

    • It has no beginning or end and continues indefinitely
    • It happens once and then stops forever
    • Only oceans are involved
    • It only occurs in Australia

15. 15. Why might a drought (long period without rain) disrupt the water cycle's usual balance for an area?

    • Reduced evaporation and rainfall lowers water available for rivers, crops and drinking
    • Droughts increase rainfall
    • Droughts have no effect on water supply
    • Droughts only affect oceans

16. 16. Why is water often described as being "recycled" through the water cycle?

    • The same water is continuously reused as it moves through evaporation, condensation and precipitation
    • New water is created every day
    • Water disappears permanently after use
    • Water only moves in one direction, never returning

17. 17. Deforestation (cutting down large forests) can affect the water cycle locally because:

    • Trees release water vapour through transpiration, which helps form rain clouds
    • Trees have no role in the water cycle
    • Forests only affect wind, not water
    • Cutting trees increases rainfall everywhere

18. 18. Why do mountainous areas often receive more rainfall than nearby flat areas?

    • Air is forced upward over mountains, cools, and condenses into rain
    • Mountains repel clouds
    • Mountains have no effect on weather
    • Flat areas always get more rain

19. 19. Which best explains why water is considered a limited and precious resource despite the water cycle?

    • Fresh, clean water is unevenly distributed and can be affected by pollution or drought
    • The water cycle makes water infinite and always available everywhere
    • Water can be created instantly when needed
    • All water on Earth is already fresh and drinkable

20. 20. Which sequence correctly describes one full stage of the water cycle?

    • Evaporation → condensation → precipitation → collection
    • Precipitation → evaporation → collection → condensation
    • Condensation → collection → evaporation → precipitation
    • Collection → precipitation → evaporation → condensation

21. 21. Why do coastal areas often have milder, more consistent temperatures than inland desert areas?

    • Large bodies of water heat up and cool down more slowly than land, moderating nearby temperatures
    • Water has no effect on nearby air temperature
    • Deserts are always closer to the sun
    • Coastal areas receive no rainfall at all