This wiki page has a great overview of our 4th grade science curriculum.

http://www.solarsystem.org.uk/planet10/
This site requires Shockwave but allows you access to download free. Great views of the solar system working as a system (a group of objects that interact). UPDATE: This site does not come up anymore as it used to. Try these instead:
http://www.kidsastronomy.com/solar_system.htm
OR
http://jrgraphix.net/research/flash_sol.php

http://i.usatoday.net/tech/graphics/iss_timeline/flash.htm
Check out how the Space Station will look when it's all put together. Notice many systems joined together to make the Space Station. Rather cool!

Land and Water
http://nsidc.org/data/glacier_photo/special_collection.html
http://tvl1.geo.uc.edu/ice/Image/pretty/pretty.html
http://nsidc.org/data/glacier_photo/repeat_photography.html
These sites show great photographs of glaciers and how they have changed the land.

http://en.wikipedia.org/wiki/Glacier
This is the article on glaciers from wikipedia. I really like the pictures from this site. Be sure to "click" on the images to enlarge the pictures.

http://www.fs.fed.us/r10/tongass/forest_facts/resources/geology/icefields.htm
Read about glaciers in Alaska. Be sure to "click" on the diagram. You'll notice some familiar vocabulary.

http://www.worldviewofglobalwarming.org/pages/glaciers.html
The "before" and "after" pictures are very interesting to compare and contrast. Please note that all of these photographs are copyrighted and not in the public domain.

http://www.fossweb.com/modules3-6/Water/index.html
Click "Evaporation" and see if you can create two situations and guess which room's water will evaporate first. I found it a little tricky at first, but I LOVED the sound effects.

http://www.slideshare.net/LawrenceCarson/astronaut-sunita-williams-pics-of-earth
Sit back and enjoy some excellent views of our beautiful planet Earth.

Ecosystems
http://www.pbs.org/wgbh/nova/methuselah/photosynthesis.html
This is a great site from NOVA that helps explain photosynthesis, a major process in most ecosystems. Click on "Go to Illuminating Photosynthesis." Click the window. Then you have three choices from the menu at the top of the window. If you choose "The Cycle," click each item to seee how they affect each other. If you choose "Atomic Shuffle," then click NEXT to see the process of photosynthesis in chemical terms. When you choose "Three Puzzlers," you can test your knowledge of photosynthesis.

http://www.kidwings.com/owlpellets/
This site shows you how owl pellets are formed and what we can find inside. For those who don't like to dissect, this virtual dissection is for you!

http://ngm.nationalgeographic.com/ngm/0302/feature5/index.html
This site takes you down into the deep ocean floor where ecosystems thrive without the sun andphotosynthesis. Instead, these ecosystems rely on chemosynthesis. How cool!

http://www.blueplanetbiomes.org/planet.htm
Check out the many different ecosystems, or biomes, of our beautiful blue planet!

http://www.fw.vt.edu/dendro/forsite/2004presentations/Taylor/forsite/forsite.html
This is a quick reference site for defining producers, consumers, and decomposers.

http://www.geography4kids.com/files/land_foodchain.html
This is another quick reference site for defining producers, consumers, and decomposers.

http://www.sheppardsoftware.com/content/animals/kidscorner/games/producersconsumersgame.htm
Play the Producers Consumers Decomposers Game.

Variables
http://www.sciencebuddies.org/science-fair-projects/project_variables.shtml
A bit wordy at the top, but worth reading to learn the vocabulary. Once you get the vocabulary, then the charts at the bottom show you what they mean during an experiment.

http://www.fossweb.com/modules3-6/Variables/index.html
Click on "Blasto The Subhuman Canonball". Fun to practice changing variables to hit a target.

http://pbskids.org/zoom/games/pendulum/
Change variables on a pendulum to change its swing.

Simple Machines
external image Blue_gears.gif

The seven simple machines:

Inclined plane
Pulleys
Levers
Gears
Wedge
Screw
Wheel and axel
Simple machines can be in anything even this!

Inclined planes:

Inclined planes also known as ramps can be used for a lot of things. Ever rode off an inclined plane on your bike or skate board?


Gears could be found in lots of things you would see on a daily bases.For example they're are gears in a bike and a car and a school bus .


Wedge

A wedge is two inclined planes put together or anything that can seperate somthing. A common known wedge is the back of a hammer

Wheel and axle

A wheel and axle is a what a wheel spins on. There are a ton of things that use these including cars trucks busses


http://www.mikids.com/Smachines.htm
This site quickly defines each simple machine and offers links for learning more.

http://www.edheads.org/activities/simple-machines/index.htm
This site has fun mini-games to play to practice finding simple machines. Fun!


http://www.fossweb.com/modules3-6/LeversandPulleys/index.html
Click "Build a Rube Goldberg Machine." Pay attention to the directions. First change the rod, then the ramp, then the catapult (lever), and then the pulley. When I hit "reset", everything resets and returns to my last adjustments except the pulley, which you have to reload each time. This was a little hard at first, but once I got the gist of how it all worked together, it was fun to get the clown to dance.

http://sunshine.chpc.utah.edu/javalabs/java12/machine/index.htm
This is a great website to explore mechanical advantage. Some fun simulations to try out.

http://www.howstuffworks.com/gear.htm
This site explains gears and offers a ton of diagrams.

http://www.mos.org/sln/Leonardo/InventorsToolbox.html
This site gives simple definitions and good pictures to illustrate the simple machines.


http://teacher.scholastic.com/dirtrep/simple/index.htm
This site gives great explanations and examples of simple machines. Sponsored by Scholastic.
http://edtech.kennesaw.edu/web/simmach.html
Here's a site that lists a plethera of simple machine websites.



Weather
http://www.noaa.gov/wx.html
Find out the most up-to-date weather forecast. Just type in your city and state a click "go."
or you can go to...

http://www.weather.com

http://www.weatherwizkids.com/temperature.htm
Learn about temperature, including wind chill and the heat index.

http://spaceplace.nasa.gov/en/kids/goes/wwa/game.shtml
Try your hand at a weather game sponsored by NASA. You can play by yourself or against as many as 3 other people.

http://skydiary.com/kids/
Good site to learn about tornadoes, lightning, and storms.

http://www.scholastic.com/kids/weather/
Click "start" and make weather! Move the gages to create the weather.

http://teacher.scholastic.com/activities/wwatch/index.htm
Use Science process skills to analyze, observe, track the weather.

http://www.brainpop.com/science/weather/hurricanes/
Brainpop requires a subscription, but some of its videos are free to view, like this one. Check out the animations. Well done.

http://www.uen.org/weather/activities.shtml