What do we call the temperature at which a liquid boils?
The boiling point.
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5
What are formed when water vapour condenses?
Clouds.
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10
What do we call the temperature at which a solid melts?
The melting point.
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5
Gas the matter that keeps its shape
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25
Explain the process of evaporation.
It happens because some particles in the liquid gain heat energy making them move faster and further apart until they escape from the surface of the liquid.
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10
Where in the water cycle does evaporation happen?
Rivers, lakes, seas, and plants.
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lifesaver
Give 25 points!
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rocket
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rocket
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baam
Lose 25 points!
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15
Name two factors that speed up evaporation.
wind and heat.
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15
What is the change in state of matter during melting?
solid + heat = liquid
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15
What is the boiling point of pure water?
100 degrees Celcius.
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15
Solid has no shape.
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15
Explain the process of condensation.
When gas particles cool down and lose energy they change into a liquid.