Here are some interesting sites. They may help you study or maybe just entertain you.
As you all know, the net is ever changing. At the time I checked these links, they were all school appropriate. In the event that anything is found that is not appropriate for school aged students, please email me at once so I can remove it.
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The Academy of Science has information on many interesting areas of science.
Earth links
Check out this awesome site for information on plate tectonics.
Here's a great site to help with
volcanoresearch. Of course you can also find the cause of volcanoes by looking at plate tectonicsor doing a plate tectonics activity.
If you want earthquakes, volcanoes or other natural disasters, try this one built by other
7th graders
or the earthquake kidszone.Here are some sites that allow you to monitor current drought and  climate conditions.Drought in the U.S.; and World drought and climate conditions
Chemistry
Here are some interactive periodic charts that are fun to work with.  Chemicool, Chemlab ; and chemicalelements. Tell me which one is the best.
Solar System
I have several links for planets. This is the most user friendly site I've found so far:
Planets and space exploration
. Here's one great for planet research. Heres a site that provides quick facts in the form of data tables. If you have a set of red-blue 3-D glasses, here's a Nasa site for you: 3-D planet tour; Finally, I could not leave out the gen of astronomy. Here are images from the Hubble telescope.
I found thsi great site on Factmonster with most any solarsystem topic you want. Here's a great site called Planet Jam;. It is not available unless you have subscribed however.
Have you ever wanted to know what the weather is like in space? Check out this cool site:
Space Weather
Who & What
Ever wanted to know who dicovered what? Here's the place to find out.Scientists and discoveries.
Museum
Visit the interactive museum: Exploratorium
Dinosaurs
Visit Zoom Dinosaur to learn about the great Thunder Lizards of the past.
Physical Science
Here is a place with many links to physical science topics called kidinfo. One place in it has a roller coaster. It also has links for all school subjects.

The
physical science classroom explains most all topics we study in physcal science.

Elements of Physical Science also covers most all topics.

The
School for Champians is a little dry but has alot of information.

How about a site on
Metrics.   There is also a place to learm more on Simple Machines.
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