How can I run a 'meteorite or meteorwrong?' activity?
Give groups a set of rocks, including slag, iron ore and basalt, and ask them to test each with simple, safe observations: magnet, weight, surface and streak.
This activity teaches observation, testing and scepticism, and mirrors what museum experts do when the public bring in suspected meteorites.
Materials. Assemble a set of samples: if possible one or two real meteorites or replicas, plus common meteorwrongs such as industrial slag with bubbles, haematite or magnetite iron ore, basalt, a flint nodule, a concretion, and perhaps a piece of manufactured iron. Provide magnets on strings, a balance, unglazed tile streak plates, hand lenses and record sheets.
Tests. - Appearance: Is there a thin dark crust? Are there bubbles or holes, which suggest slag or volcanic rock? Are there layers, which suggest sedimentary rock? - Weight: Does it feel heavy for its size? - Magnetism: Does it attract a magnet? Most meteorites do; so do magnetite and some slag. - Streak: Rub a corner on the tile. Haematite gives a red-brown streak and magnetite a black one; most meteorites leave little or a faint grey streak. Only do this on test samples, not real meteorites. - Inside: Look at a cut face, if one is available, for metal flecks or chondrules.
Decide. Groups record evidence for and against each being a meteorite. Reveal answers and discuss which tests were most useful and why no single test is enough.
Reflect. Explain that experts ultimately confirm meteorites with microscopes and chemical analysis. This activity is excellent preparation for pupils who think they have found a meteorite: it teaches them to collect evidence before drawing conclusions.
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