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