This unit has been created to meet specifed Virginia Standards of Learning in Science for third graders. The content notes section includes a page on the SOLs that are covered in this unit, background information and vocabulary. The button below is a link to a multi-media unit on water resources from The Habitable Planet produced by Annenburg Learner for teachers and adult learners. I recommend this high-quality resource to teachers to boost background knowledge of content in the area of water resources.