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I. Microcrystals while you wait

The idea of this is to grow crystals of coloured metal compounds in drops of water on glass slides, under a biological microscope. A drop of water will completely dry up and crystallize in 30 minutes, so if you start 'em 15 minutes before class, students can observe the progress of crystal growth They don't quite grow visibly, but almost: have the students check them every 2 minutes or so

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490 Students on Nea Kameni

The centre of the Thera caldera is occupied by two low basaltic volcanoes known as the Kamenis. Palea (ancient) Kameni which first is recorded in Roman times, has a younger volcano, Nea (new) Kameni on its eastern flank. Nea Kameni's last major eruption was in 1926, although the volcano also exhibited activity from 1939 to 1941 and in 1950. This class photo was taken at the summit of the 1950 crater looking toward the north. The remnants of the caldera rim can be seen on the far left and right sides of the photograph.