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Q25: According to the passage, a hot spot on Earth’s surface is an indication of which of the following? AE-A E - An untapped reservoir of hot rock in the base of the mantle
是surface - Volcanic activity at the edge of a plate
- Solid mantle rock under tremendous pressure
- The occurrence of a phenomenon unique to the Pacific plate
- A plume of hot mantle rock originating near Earth’s core
Answer: 【总结】第二段:主题句:有种火山的形成是由于一种把地球deep interior进行cool化的机制。Because of its proximity to Earth’s core, the rock at the base of the mantle is much hotter than rock in the upper mantle.由于地幔底部的rock接近core,所以比上层地幔的rock 更热。 然后说:地幔的岩石越热,越不会流动。储蓄这种hot rock是在地幔底部进行的。 当储蓄到极致时,hot rock的领域会强迫其流向向地球表面的上层地幔。因此mantle plume就形成了。一旦形成。。。(讲原理) 最后提到hot spot的概念:The surface mark of an established plume is a hot spot。。。 即:hot spot是已形成的plume的表面痕迹—即一个独立和远离板块边缘的一个上山的火山区域。 hot spot = plume 的surface . 而这种mantle rock依照前面的原理,是proximity to Earth’s core的,区别与第一段边缘火山的观点。 正确答案太隐蔽了,诡异~ |