How Big is the Earth?

Age range: 12 – 16 years
Prep. time: 15 minutes + the time to find a partner school
Lesson time: 30 minutes
Cost per activity:  0
Includes the use of: calculator

In this exercise, we will measure the circumference of the Earth using the same procedure as Eratosthenes did 240 BC. To do this, we need to measure the height of the sun in two locations directly north-south of each other. Are you able to get answers close to the result we have today?

In this lesson students will also use techniques including basic mathematics (multiplication and division), measurement techniques, and geometry.

Student Guide

Teacher Guide

Identifying Micrometeorites

Did you find a curious looking rock? With the help of these instructions you can investigate if it could be a meteorite.

This presentation will lead you through the common features of micrometeorites, including magnetism, weight, surface features and evidence of fusion crust, chondrules, metal flakes, patina and rust.

Interesting findings are worth submitting to an expert for analysis. With scientific methods any meteorites can be reliably identified and categorised. The presentation also guides you to where you might find such advice!

This resource is also available in Finnish.

Slide Pack – English

Slide Pack – Finnish

How to identify a meteorite?

Did you find a curious looking rock? With the help of these instructions you can investigate if it could be a meteorite (or a meteowrong!). You can also go outdoors and pick any rock for investigation. Or how about hunting micrometeorites?

This material is also available in:

Keywords: meteorite, micrometeorite, small solar system bodies