1. Lava from the western flank flowed over basement rocks and trachytes of the pre-explosive phase . 2. The felsic shield-building stage ended with the post-explosive phase . 3. This situation is inching close to an explosive phase , 4. In contrast, lava from the summit flowed over pyroclastic rocks and lava flows of the explosive phase . 5. In this current explosive phase , researchers expect Mount St . Helens to generate less ash than in 1980. 6. Another explosive phase , this time dominated by long pumice flows that contain charcoal followed and generated the lava dome. 7. The final volcanic event of the post-explosive phase produced } } thick trachyte lava flows on the western flank. 8. On 14 April 2010, however, the eruption entered an explosive phase and ejected fine glass-rich ash to over into the atmosphere. 9. The case has entered a potentially explosive phase , with lawyers seeking details about the sex lives of Clinton and Mrs . Jones. 10. "It's in an explosive phase right now, " said Dr . Ralph Potkin, a pioneer in oxygen chamber therapy and operator of the center.
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