Discover water's freezing point and salt's effects on ice with 2nd and 3rd grade. A complete unit with an experiment, reading passages, further exploration, and a STEM challenge. Uses inexpensive and easy-to-find supplies. Great for the winter and Christmas season.Included in the Hands-On Investigation and Teacher Guide:K-2 NGSS Science and Engineering Practices Alignment2nd Grade Structure and Properties of Matter NGSS Alignment3-5 NGSS Science and Engineering Practices AlignmentBackground Inf