Science learners will love the interactive Science lessons found on Harcourt's Science Up Close site. The site has interactive explanations and demonstrations covering a variety of topics in Science for grades 1 through 6. The graphics are amazing and the explanations are very clear and easy to follow.
The site is organized by grade level and contains multiple topics for each grade. For example, Grade 3 contains 16 interactive resources covering a wide-variety of topics including photosynthesis, fossils, water cycle, lunar eclipse and even how a door knob works.