Land Changes – Erosion and Weathering – A Third Grade PowerPoint Introduction is a comprehensive PowerPoint presentation of the third grade science text about Land Changes. The presentation includes information about land changes, weathering, erosion, glaciers, cave formation, and people changing the surface of the Earth. Explanations are given. Vocabulary is included. It also includes 2 editable activities that are also adjusted to PDF files. The white-backed PowerPoint slides are included in case adjustments need to be made to best suit your class. Activity one is a Venn diagram for the comparisons between weathering and erosion. The second activity is an interpretation of an erosion joke (basically explaining the concept/humor in the joke either in a listing or writing form. The presentation and activities are in line with the third grade VA Standards of Learning.