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[originaltext] Today I want to talk about the Earth’s last major climatic sh
[originaltext] Today I want to talk about the Earth’s last major climatic sh
游客
2024-04-18
20
管理
问题
Today I want to talk about the Earth’s last major climatic shift, at the end of the last ice age.
But first, let’s back up a moment and review what we know about climatic change in general. First, we defined "climate" as consistent patterns of weather over significant periods of time.
In general, changes in climate occur when the energy balance of the Earth is disturbed. Solar emergy enters the Earth’s atmosphere as light and is radiated by the Earth’s surface as heat. Land, water, and ice each affect this energy exchange differently. The system is so complex that, to date, our best computer models are only crude approximations and are not sophisticated enough to test hypotheses about the causes of climatic change.
Of course, that doesn’t keep us from speculating. For instance, volcanic activity is one mechanism that might affect climatic change. When large volcanoes erupt, they disperse tons of particles into the upper atmosphere, where the particles then reflect light. Since less light is entering the system of energy exchange, the result would be a cooling of the Earth’s surface.
Of course, this is just one possible mechanism of global climate change. In all probability, a complete explanation would involve several different mechanisms operating at the same time.
10. How does the speaker begin her discussion?
11. What does the speaker mean by the phrase"the energy balance of the Earth?"
12. Why do meteorologists have difficulty testing hypotheses about climatic changes?
选项
A、The releasing of heat from the Earth’s core by volcanoes.
B、The amount of energy used by different countries around the world.
C、The rate at which sunlight is converted to heat by the Earth.
D、The amount of fossil fuels stored in the Earth.
答案
C
解析
气候发生变化是因为地球的能量平衡受到破坏。太阳的光能进入大气层后被地表转化为热能,大地、水和冰都会影响着这一能量交换过程。可见,“地球的能量平衡”是指太阳光转化成热能的过程,与之意思相符的只有选项C。这道题通过常识也可以判定正确答案。
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