Tuesday, 28 October 2014

What is groundwater?

To Read with Annie

 Groundwater is the water found underground in the cracks and spaces in soil, sand and rock. It is stored in and moves slowly through geologic formations of soil, sand and rocks called aquifers.

 How much do we depend on groundwater?

  • Groundwater supplies drinking water for 51% of the total U.S. population and 99% of the rural population.
  • Groundwater helps grow our food. 64% of groundwater is used for irrigation to grow crops.
  • Groundwater is an important component in many industrial processes.
  • Groundwater is a source of recharge for lakes, rivers, and wetlands.

Rain + GroundwaterAquifers are typically made up of gravel, sand, sandstone, or fractured rock, like limestone. Water can move through these materials because they have large connected spaces that make them permeable. The speed at which groundwater flows depends on the size of the spaces in the soil or rock and how well the spaces are connected.

Groundwater can be found almost everywhere. The water table may be deep or shallow; and may rise or fall depending on many factors. Heavy rains or melting snow may cause the water table to rise, or heavy pumping of groundwater supplies may cause the water table to fall.
Groundwater supplies are  recharged, by rain and snow melt that seeps down into the cracks and crevices beneath the land's surface. In some areas of the world, people face serious water shortages because groundwater is used faster than it is naturally replenished. In other areas groundwater is polluted by human activities. 

Make the Summary

Friday, 10 October 2014

Weathering, erosion, and deposition

You need watch the next videos:

Task: Watch the vídeos,read the text on pages 18-19 and use this link
After that, you need do the next activities:

  • What is erosion?
  • What is Weathering?
  • What types of erosion do you think exist?
  • What are the main agents of erosion ?
When you finish, you send me a E-mail with the activities

After that, you can enjoy this video

Sunday, 5 October 2014

The stucture of the Earth

The earth — think it's solid as a rock?

Our planet might seem fixed and rigid, but a closer look reveals that it is constantly shifting under our feet. Delve into the earth's interior, learn about its tectonic plates and their movements, and discover how mountains, volcanoes, and earthquakes are formed.

Start your exploration with Earth's Structure.

Task : Make a Summary of the vídeo and the link. Send me a e-mail with it