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Satellite images of Mercury and Mars are used to illustrate craters and generate a discussion about their cause. After comparing those images with one of Earth, students explore the reason for the lack of visible craters on our planet. The abundance... (View More)

Audience: Elementary school
Materials Cost: 1 cent - $1 per student

This activity is designed to get students to observe that two objects of equal size can appear to be of different sizes when placed at a greater or lesser distance from the observer. This is intended to assist students in visualizing that the sun is... (View More)

Keywords: Visual angle
Audience: Elementary school
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