marus+topic

A cloud is a large collection of very tiny droplets of water or ice crystals. The droplets are so small and light that they can float in the air.
 * What are clouds?**

**How are clouds formed?** All air contains water, but near the ground it is usually in the form of an invisible gas called water vapor. When warm air rises, it expands and cools. Cool air can't hold as much water vapor as warm air, so some of the vapor condenses onto tiny pieces of dust that are floating in the air and forms a tiny droplet around each dust particle. When billions of these droplets come together they become a visible cloud


 * A plastic (soft drink) bottle
 * Some stones or pebbles
 * Tape
 * Marker (felt pen)
 * A ruler

For so long, Rotorua's Sarah Cowley has wanted to compete at the Olympics _ now her dream has been realised.

The 28-year-old has been named to represent New Zealand in the heptathlon at this year's London Olympics.

She is one of nine athletes named in the New Zealand athletics team for the games which get under way on July 27.

It will be Cowley's first Olympic Games. The heptathlete represented New Zealand at the 2006 Commonwealth Games in Melbourne.

Cowley posted on her website it was "surreal'' to make the squad