Grade 6 Science — States of water and the water cycle

1.A block of ice is heated, and the heating is kept up. Put the three states in the order the water passes through them.

• Water vapor
• Water
• Ice

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

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

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

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

4.Cloud droplets are light enough to float. What has to happen before they fall as rain?

• a) The wind pushes the droplets downwards
• b) The droplets freeze solid and drop as ice
• c) Many droplets join into drops heavy enough to fall
• d) The cloud runs out of dust particles to sit on

5.An ice cube left on a table turns into water. What is this change called?

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

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

7.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?

8.Tap the stage of this water cycle where water leaves the ocean and enters the air as vapor.