Trees study- From: I'm a teacher, get me OUTSIDE here! Sorting sticks from longest to shortest. Good outdoor group activity for preschoolers that can be left for individual students to return to time and again.
Sink or Float activity using nature. Students will be experimenting with leaves, sticks, acorns, rocks, etc in the water table. Students will make predictions on what objects they think will sink or float and then reflect on their findings.