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...Open University's Science courses and qualifications Diorite is a coarse-grained intrusive igneous rock. It contains large interlocking, randomly oriented crystals. It is a dark coloured rock, usually medium to dark grey, containing many mafic crystals. Mostly it looks like dark coloured granite. [Diorite] How was it formed? Diorite formed deep within the Earth’s crust...

...Open University's Mathematics courses and qualifications Code Break is an interactive Web app consisting of three ciphers: Pigpen, Caesar and simple substitution (solved by frequency analysis). Earn stars for each challenge, and learn about code-breaking through the ages by playing our interactive ‘Could you be a code breaker?’ [Front image capture for the game 'CODE...

...and mass spectrometry. This material is taken from The Open University course S205 The molecular world... Molecular Science: Spectrometry A short introduction to this album. Infra-red Spectrometry Preparing samples for infra-red spectroscopy Nuclear Magnetic Resonance Preparing samples for 1H and 13C nmr spectroscopy Mass Spectrometry Analysis by mass spectrometry...

...Open mathematics... Getting your Bearings A short introduction to this album. Ordnance survey maps Learn how ordinance survey maps are accurately produced and quality controlled. Contour lines Three walkers begin a field trip navigating a route in the peak district. Taking a bearing Discover how to get your bearings with a compass and a map. A saddle point Using contour...