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Cause Small Variations: Rock bodies, whose mass differs greatly from that of the surrounding area, cause small variations or anomalies in the local gravitational field, making it possible to detect them with sensitive gravimeters [Key]. Gravi-meters work on the principle that gravity changes will cause minute variations in a very fine quartz spring [3]. These instruments are sensitive enough to detect minute gravitational changes as small as one ten-millionth of a gramme.
Eruptions cannot be prevented, but they can, in some cases, be predicted. This is done principally by monitoring the small earthquakes created by rising magma, measuring the swelling of the ground with tiltmeters and watching variations in the output of gas and steam vents.
The pure forms of each of the primary, secondary, and tertiary colors can be modified to create an enormous range of tonal variations simply by adding differing amounts of white or black. However, it is the subtle variations in tone that are most likely to produce color combinations that blend together successfully in a room's •r scheme. For example, a range of pale i-greens and blues will combine happily ither.
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