松脂岩

These include pumice and tufa. 2. Lava-based soil are the product of lava flows from the volcano. 90 percent of lava-based soil is composed of basalt with the other ten percent including andesite, pitchstone, rhyolite, and trachyte.

这种土壤含有浮石和石灰华。2）熔岩为基础的土地，由火山爆发后产生的熔流产生。90%是由玄武石组成的熔岩，另外10%是中长石、松脂岩和粗面岩。

Because three differences lie in the pearlite to have the round arc crack which the condensation forms, calls the pearlite structure, the water content 2~6%; The pitchstone has the unique resinous luster, the water content 6~10%; The black sunlight crag has the glassy luster and the conchoidal fracture, the water content is smaller than 2% generally.

三者的区别在于珍珠岩具有因冷凝作用形成的圆弧形裂纹，称珍珠岩结构，含水量2~6%；松脂岩具有独特的松脂光泽，含水量6~10%；黑曜岩具有玻璃光泽与贝壳状断口，含水量一般小于2%。

The pearl ore includes the pearlite, shines black the crag and the pitchstone.

珍珠岩矿包括珍珠岩，黑曜岩和松脂岩。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。