This is a page on the scholastic website that has interactive whiteboard activities for Earth Day. These activities include lessons on water conservation and recycling etc.
EducationCity is a subscription website that features games for grades K-6 in math, language arts, and science. With the subscription, students can keep track of their progress in the games with the "success tracker", and then the teacher gets a compilation of student scores, broken down by subject and graphed to show how they are doing. It can be used individually with students, or in the "Interactive Whiteboard Mode" whole class/small group.
BrainPop Jr. is in the BrainPop family of websites. It features educational videos on a wide variety of topics, from health to math and literacy. Students love watching the videos, and then it includes followup activities, such as quizzes, games, and even jokes. It requires a subscription for some videos, but others are free.