STEM: MARSHMALLOW STRUCTURE ENGINEERING --- This digital file (.PDF) activity is focused introducing how earth changes can affect structural engineering efficacy and is perfect for individual or small group activity. After completing a unit on ‘Earth Changes: Slowly and Quickly,’ I presented a challenge to my 2nd grade students. This activity is a 4-page .PDF file, including (title page, instruction page, activity sheet, credit pages). The buyer will need to print to use. This activity integrat