National Geographic is an oldie but a favorite of mine. It offers so much variety and is very student friendly. To start out my Earth Science class I would do a webquest of sorts. Students would be prompted with a question – What is Planet Earth? They would be directed to this link and be given the class to explore the website. I would ask them that they find five facts about Planet Earth that they did not know before and write one question they came up with. Finally I would ask they make an attempt at answering the question and coming up with a definition for Planet Earth. We would then have a classroom discussion and come up with a working definition that we could refer to for the remainder of the class. This helps students by into the class and also puts the most important definition into their own words. Just a fun, easy way to get started for the year I think!