Most first graders like to study nature. They have endless questions about the world around them. Spend time with your child finding answers for their questions. Encourage your child to explore, observe, and ask questions.
Plants seeds together and monitor the growth. Make charts or a timeline. Plant a garden and let your child harvest the vegetables and cook some of them. Make a bird feeder and observe the visitors that stop by. Catalog and classify leaves, bugs, seashells, and rocks. Take nature walks together. Do not forget your camera and notebook.
Books are very helpful, but rather than rely on books for all your information, use your own observations in the backyard and neighborhood first. Have your child make books about their own discoveries, and share them with others.