| 41. | Their distinguishing feature is a hard mineral shell or frustule composed of opal ( hydrated, polymerized silicic acid ).
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| 42. | Diatoms need, among other nutrients, silicic acid to create biogenic silica for their frustules ( cell walls ).
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| 43. | The Long Valley volcano is unusual in that it has produced eruptions of both silicic lava in the same geological place.
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| 44. | Silicic acid is reputed to be the most natural form of element in the environment and is readily removed by kidneys.
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| 45. | Possibly after the ice ages, north of Acamarachi a silicic coulee was erupted on the saddle between Acamarachi and Colachi.
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| 46. | Silicic acid is the general name for a family of chemical compounds containing the element silicon attached to oxide and hydroxyl groups.
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| 47. | The sponge extracts silicic acid from seawater and converts it into silica, then forms it into an elaborate skeleton of glass fibers.
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| 48. | Volcanism in the High Lava Plains is bimodal, having both basaltic ( mafic ) and rhyolitic ( silicic ) types of lava.
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| 49. | During Plinian eruptions, pumice and silicic magma is fragmented in the volcanic conduit, because of decompression and the growth of bubbles.
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| 50. | The hot spring water contains minerals and trace elements such as strontium, lithium, selenium, and other silicic acid mineral elements.
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