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Class 6 Science — States of water and the water cycle

Tell the three states of water apart by how they behave, name the changes between them, and follow water round the water cycle.

Name: ________________________

Before you start

The stages water passes through on its way from the ocean and back again.

1234
  1. 1. Evaporation
  2. 2. Condensation
  3. 3. Rain
  4. 4. The ocean

Water rises from the ocean as vapour, cools high up into cloud droplets, falls back as rain and flows to the ocean again. There is no first stage — water has been going round this loop far longer than anyone has been watching it.

  1. 1.Clothes take longer to dry on a rainy day than on a dry one. What is the reason the chapter gives?

    • a) The air already holds a lot of water vapour
    • b) Cloth soaks up more water when it is cloudy
    • c) Evaporation stops below a certain temperature
    • d) Rainwater is heavier than ordinary water

  2. 2.Dew forms on plants overnight, and drops gather under the lid of a boiling pan. What is the name of the change turning water vapour back into liquid?

  3. 3.How does the chapter say a cloud is formed?

    • a) Smoke from the ground gathers and turns white
    • b) Cold air sinks and squeezes water out of the ground
    • c) Rising air cools, and its water vapour turns into droplets around dust particles
    • d) Water is lifted from the sea as whole drops by the wind

  4. 4.Sort each substance by the state it is in.

    Groups: Solid · Liquid · Gas

    • Milk
    • Stone
    • Ice
    • Oxygen
    • Water vapour
    • Water

  5. 5.The water cycle turns round and round with no true beginning, so start it from evaporation and put the stages in order from there.

    • Rain
    • Evaporation
    • Condensation
    • Flowing back to the ocean

  6. 6.Water moves round between the Earth's surface and the atmosphere and comes back again. This circulation has a two-word name. What is it?

  7. 7.Match each state of water to the way it behaves when you put it in a container.

    • Ice
    • Water
    • Water vapour
    • spreads through the whole space available
    • keeps its own shape
    • takes the shape of its container

  8. 8.Water is put into a freezer and turns into ice. What is this change called?

    • a) Melting
    • b) Evaporation
    • c) Condensation
    • d) Freezing

Answer key — Class 6 Science — States of water and the water cycle

  1. 1. a) The air already holds a lot of water vapour
  2. 2. condensation
  3. 3. c) Rising air cools, and its water vapour turns into droplets around dust particles
  4. 4. Ice → Solid; Stone → Solid; Water → Liquid; Milk → Liquid; Water vapour → Gas; Oxygen → Gas
  5. 5. 1. Evaporation 2. Condensation 3. Rain 4. Flowing back to the ocean
  6. 6.
    • water cycle
    • the water cycle
  7. 7. Ice → keeps its own shape; Water → takes the shape of its container; Water vapour → spreads through the whole space available
  8. 8. d) Freezing