The Cooling of Early Earth Earth formed just under 4.6 billion years ago, and for its first 50 to100 million years, it was a boiling ball of liquid rock without a permanent crust (hard outermost layer).An important event in Earth's earliest phase is known as the differentiation event, ...
托福阅读真题第47篇TheCoolingofEarlyEarth 地球形成于 46 亿年前,在最初的 50 到 1 亿年中,它是一个沸腾的液态岩石球,没有永久地壳(最坚硬的外层)。地球最早阶段的一个重要事件被称为分化事件,这完全改变了地球最初均匀的组成。它发生在大约 45 亿年前,当时地球已经变得足够大,压力足以推动内部温度超过 1,...
but the energy from the intense early impacting by objects from space had pushed temperatures up well above the melting temperature of rocks. Still, research has demonstrated that as early as about 4.4 billion years ago, Earth's surface had not only cooled sufficiently to form...
然后,密度更大(富含金属)的物质下沉到地球的中心,密度较小的(岩石)物质向地表上升。下沉的密集物质形成了地球的镍铁核心,也就是地球的内部 3500 公里左右。升起的较轻的物质形成了密度较低的岩石地幔,即地球” 地核的形成改变了地表条件。是因为它为地球的发展创造了合适的条件磁场,它起源于地球核心外层的运动。早...
这是因为它为地球磁场的发展创造了适当的条件,磁场源于地核外层的运动。人们早就知道磁场在大约35亿年前就已经运行了,最近的研究将其带回了40亿年前。磁场是地球对太阳风(来自太阳的带电粒子)的唯一真正保护,太阳风在磁场开始之前就从最早的大气层中剥离气体。因此,分化事件被认为是减少光元素从大气到太空的损失的...
Earth's surface had not only cooled sufficiently to form early crust (likely below 1,000°C) but even enough to allow for the presence of liquid water, which at modern atmospheric pressure would mean that temperatures had dropped below 100°C. However, at higher pressures this value is highe...
所属专辑:托福阅读 音频列表 1 TF048-The Commercialization of Agriculture in the United States 64 2023-03 2 TF047-The Cooling of Early Earth 39 2023-03 3 TF046-The Decline of the Arctic Fox in Scandinavia 31 2023-03 4 TF045-The Documentary Film in the United States ...
The Cooling of the EarthTHERE are strong reasons for believing that the earth was wholly fluid at an early stage of its history. My present topic is the manner in which such a fluid earth would solidify and afterwards cool to its present state.HAROLD JEFFREYS...
Eppelbaum et al 2014 'Applied Geothermics' 6.2 The Early Earth Atmosphere & Cooling of the Earth 来自 ResearchGate 喜欢 0 阅读量: 114 作者:LV Eppelbaum,I Kutasov,A Pilchin 摘要: During accretion, a magma-ocean with a surface temperature of at least about 1,300–1,500 K was formed ...
Earth's Sun was a weakling when it was younger. Around three or four billion years ago, the star's energy was about 20 percent to 25 percent lower than what's experienced today. If that was still true today, one would expect Earth would be an iceball, bu