You can use graph paper to help with making straight lines. Have the student give the measurements of the building. The students will then build their building with toothpicks and marshmallows. Chemist Mix vinegar and baking soda inside a zip lock baggy. Allow students to experiment with different amounts of each ingredient.
Botanist Have the students grow bean plants inside a plastic cup.
Environmental Scientist Pour a little bit of oil inside a bowl of water. Have the students hypothesize about how to get the oil out of the water. Let the students use a variety of materials to get the oil out of the water. Have the students work with partners. One student will close their eyes and plug their nose.