One is based on Scrabble, the board game where players try to form words from letters with different point values.

VOA: special.2011.02.10

Tornadoes form when winds blowing in different directions meet in the cloud and begin to turn in circles.

VOA: special.2009.06.09

Tornadoes form when winds blowing in different directions meet in the clouds and begin to turn in circles.

VOA: special.2010.05.11

Her work "Variations on H" is made up of different colors of finely made hands connected together to form a flowing cloth.

VOA: special.2009.11.04

Several different species of coral can be present in the different colonies that form the reef structure.

VOA: special.2010.08.10

Snowflakes come in different sizes. As many as one hundred crystals may join together to form a snowflake larger than two and one-half centimeters.

VOA: special.2010.01.05

The shape of a snow crystal may change from one form to another as the crystal passes through levels of air with different temperatures.

VOA: special.2010.01.05

She liked the way she could easily form this plastic modeling material into different shapes.

VOA: special.2009.05.18