It is formed by the action of wind and water on rocks over thousands of years.

VOA: special.2009.09.14

Tornado seasons are the result of wind and weather patterns.

VOA: special.2010.05.11

The wind came again. Finally,the men heard a new sound C the sound of waves breaking and crashing on the shore.

VOA: special.2010.03.06

Russian scientists Alexei Androsov and Naum Voltzinger studied wind action in an earlier examination of the Red Sea crossing.

VOA: special.2010.10.19

Plantings in the wetlands help hold down the soil against the forces of erosion, like wind and water.

VOA: special.2009.10.06

I was born on the plains where the wind blows free, and there is nothing to break the light of the sun.

VOA: special.2010.04.01

Radioactive particles travel in the wind and get absorbed into soil with the help of rain and snow.

VOA: special.2011.03.29

A pleasing piece of music could be heard, and a gentle wind was blowing through the window.

VOA: special.2009.09.05

Pieces of gypsum broke off. The wind wore them away to a size small enough to pick up and carry for short distances.

VOA: special.2010.01.04

It takes the right combination of wind,temperature,pressure and humidity to create even a weak tornado.

VOA: special.2010.05.11

This time,scientists hope to learn more about the formation, wind speed and shape of tornadoes.

VOA: special.2009.06.09

Rain,snow,ice,wind, and plant roots rubbed away at the top of the new canyon.

VOA: special.2009.10.07

He wanted to play music that showed the power of fire and stars just for the old man, and with the storm and the wind to join him.

VOA: special.2010.05.08

More than ninety percent of these jobs will be in the private sector -- jobs rebuilding our roads and bridges, constructing wind turbines and solar panels, laying broadband and expanding mass transit."

VOA: special.2009.02.27

Some mountainous regions benefit from hydropower. Less than four percent of the nation's electricity demand is met with renewable sources like solar and wind power.

VOA: standard.2010.03.23

"Since we have introduced the feed-in tariff, we have seen a strong increase in the production of power from wind,from biomass and from solar power.

VOA: standard.2010.03.23

With a solar powered sail and using the sun and wind to power the batteries, the purpose of the mission is to show that renewable energy works.

VOA: standard.2009.12.10