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| 31. | acidic rocks have a silica content over 70 % Granite is the typical example of acidic intrusive igneous |
| 岩石中Si02含量大于70％时，称为酸性岩，花岗岩就是酸性侵入岩石的一个典型例子，它的矿物成分主要是钾长石、石英以及少量云母， |
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| 32. | the commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of |
| 最常见的凝固火山岩，是一种致密的深灰色火成岩，纹理细密，主要由富钙的斜长石和辉石组成。 |
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| 33. | igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite |
| 火成岩产生于火山喷发和在地表或接近地表的地方凝固；流纹岩或安山岩或玄武岩的。 |
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| 34. | Of the three great classes of rocks, igneous rock constitutes most of the earth's crust though their |
| 在3大类岩石中．火成岩组成了地壳岩石的大部分，虽然火成岩大都被沉积岩所覆盖。 |
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| 35. | Of or relating to igneous rock that is forced while molten into cracks or between other layers of rock |
| 形成侵入岩的属于或关于融入岩石裂缝或岩层之间时直接生成火成岩的 |
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| 36. | a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma |
| 一种火成岩，由富含稀有元素的岩浆结晶而成的极粗的花岗岩构成。 |
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| 37. | A common, coarse-grained, light-colored, hard igneous rock consisting chiefly of quartz, orthoclase or |
| 花岗岩一种常见的、晶粒粗糙的浅亮色坚硬的火成岩，主要由石英、正长石或微斜长石及云母组成，用于纪念碑和建筑物 |
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| 38. | A change within an intrusive igneous rock caused by the assimilation of portions of the surrounding rock |
| 内变质作用由于周围岩石同化作用而在侵入火成岩内部产生的变化 |
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| 39. | space, rather than as part of a larger body, or else they would have merged into a more conventional igneous |
| 这些独立的小滴一定是形成于自由的空间，而不是生下来就是较大个体的一部分，不然他们会融入更普通的火成岩。 |
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| 40. | A dark - gray to black, fine - textured igneous rock composed mainly of feldspar and pyroxene and used |
| 辉绿岩一种贝岩，颜色深灰至黑，带有细微网纹，主要由长石和辉石构成，用作纪念碑或碎石块 |
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