Discover water's freezing point and the salt's effect on ice with a complete project-based unit. Uses inexpensive and easy-to-find supplies. This engaging unit includes an experiment, reading passages, further exploration, and STEM Challenge. Great for the winter and Christmas season. Included in the Hands-On Investigation and Teacher Guide:5th Grade Structure and Properties of Matter NGSS Alignment3-5 NGSS Science and Engineering Practices AlignmentBackground Information and Tips3 Hands-on A