Volcanic eruptions occur __ magma pressure exceeds the strength of the Earth's crust., although, when, unless, whereas, __ earthquakes cannot be predicted accurately, scientists continue to study seismic activity., because, although, if, when, Flooding becomes severe __ heavy rainfall continues for several days., unless, when, although, so that, __ the temperature rises, glaciers begin to melt at a faster rate., if, although, since, so that, The drought will persist __ there is no significant rainfall., if , although, because , when.

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