Water Cycle
The following sites will help you find information on the water cycle:
http://www.kidzone.ws/water/
http://ga.water.usgs.gov/edu/watercycle.html
http://epa.gov/climatechange/kids/water_cycle_version2.html
http://oncampus.richmond.edu/academics/education/projects/webunits/water/watercycle.html
Clouds
http://www.weatherwizkids.com/cloud.htm
http://www.eo.ucar.edu/webweather/cloudhome.html
http://www.urbanext.uiuc.edu/weather/2.html
http://vortex.plymouth.edu/clouds.html/
Forces that affect weather
http://www.kidsgeo.com/geography-for-kids/0123-source-of-air-masses.php
http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/weather_systems/air_masses.html
http://serc.carleton.edu/NAGTWorkshops/visualization/collections/weather_fronts.html
http://www.usoe.k12.ut.us/curr/Science/core/4th/4thSciber/weather/html/fronts.htm
http://www.climateandweather.net/world_weather/weather_fronts.htm
http://kids.earth.nasa.gov/archive/air_pressure/index.html
http://www.bbc.co.uk/weather/features/weatherbasics/airpressure.shtml
Factors that influence climate
http://www.ecn.ac.uk/Education/factors_affecting_climate.htm
http://www.classzone.com/books/earth_science/terc/content/investigations/es2101/es2101page02.cfm
http://www.kidsgeo.com/geography-for-kids/0077-land-and-water-effect-temperature.php