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Last updated at 12:27 BST, Wednesday, 26 August 2009

Clouds

Kate and Rebecca discover how clouds have been classified over the last two hundred years and hear from the founder of the Cloud Appreciation Society.

This week's question:

Not all clouds are a sign of rain. In fact, some mean that good weather is about to arrive. Which type of cloud is a sign of sun rather than rain?

a) a wispy and thin cloud
b) a tall and fluffy cloud
c) a gray flat cloud

Listen out for the answer in the programme!

Listen to the programme

Clouds

Vocabulary from the programme

classified

divided in to groups according to height and appearence

species

normally refers to a set of animals or plants in which the members have similar charactristics to each other

formation

shape or way something is made

amateur meteorologist

someone who studies the weather as a hobby, not as a job

fluffy

light and full of air

to be under a cloud

an expression to describe someone who is sad or depressed

to have a cloud hanging over him

when someone is feeling depressed or unhappy

a cloud on the horizon

when there is trouble or bad things ahead

Types of clouds

cumulus clouds

fluffy, white clouds which look a bit like ice cream

cirrus clouds

thin, wispy clouds which tend to be high up

stratus clouds

low, gray clouds which usually cover most of the sky

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