托福口语考试背景知识学习积累，在托福口语备考过程中，除了基础知识的积累，高频的背景知识也是需要记忆的。为了帮助大家更好地备考托福，今天小编为大家整理了相关的内容，希望对大家的托福备考会有参考作用。
托福口语考试背景知识学习积累
Lava
Lava is magma that breaks the surface and erupts from a volcano. If the magma is very fluid, it flows rapidly down the volcano’s slopes. Lava that is stickier and less fluid moves slower. Lava flows that have a continuous, smooth, ropy, or billowy surface are called pahoehoe (pronounced path HOH eel hob eel) flows; while a (pronounced ah ah) flows have a jagged surface composed of loose, irregularly shaped lava chunks. Once cooled, pahoehoe forms smooth rocks, while a a forms jagged rocks. The words pahoehoe and a are Hawaiian terms that describe the texture of the lava.
熔岩是一种岩浆，它能打破地表并从火山喷发出来。如果岩浆是非常流体的，它会迅速从火山的斜坡流下来。熔岩的黏性更强，流动的速度更慢。熔岩流具有连续的、光滑的、粘稠的或起伏的表面被称为梭形(发音路径HOH鳗鱼)流动；而(发音为啊)流有一个由松散的不规则熔岩块组成的锯齿状表面。一旦冷却，梭梭形成光滑的岩石，而一个形成锯齿状的岩石。Pahoehoe和a是描述熔岩质地的夏威夷术语。
Lava may also be described in terms of its composition and the type of rock it forms. Basalt, andesitic, decides, and hyalite is all different kinds of rock that form from lava. Each type of rock, and the lava from which it forms, contains a different amount of the compound silicon dioxide. Basaltic lava has the least amount of silicon dioxide, andesitic and deictic lava have medium levels of silicon dioxide, while holistic lava has the most.
熔岩也可以用它的组成和它形成的岩石类型来描述。玄武岩，安山岩，决定，玻璃岩都是由熔岩形成的不同种类的岩石。每种类型的岩石及其形成的熔岩都含有不同数量的复合二氧化硅。玄武岩熔岩中二氧化硅含量最少，安山岩和指示熔岩中二氧化硅含量较低，整体熔岩含量最高。
以上就是小编为大家介绍的托福口语考试背景知识学习积累的相关内容了，想要了解更多资讯大家可以咨询朗阁教育官网，相信一定会为各位烤鸭答疑解惑。最后，小编预祝大家可以尽早考过托福考试，实现自己的目标。
