| We can still fix it | It is estimated that one-eighth of Earth's surface is suitable for humans to live on—three-quarters of Earth's surface is covered by oceans, leaving one-quarter as land |
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| Geological Society, London, Special Publications | In , the exact shape that Earth's oceans would adopt in the absence of land and perturbations such as tides and winds is called the |
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26| Chemical composition See also: Chemical composition of the crust Compound Formula Composition Continental Oceanic SiO 2 60 | By comparison, the oldest dated is 4,030 Ma, although zircons have been found preserved as clasts within Eoarchean sedimentary rocks that give ages up to 4,400 Ma, indicating that at least some continental crust existed at that time |
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| The final major mode of heat loss is through conduction through the lithosphere, the majority of which occurs under the oceans because the crust there is much thinner than that of the continents | A portion of the core's thermal energy is transported toward the crust by , a form of convection consisting of upwellings of higher-temperature rock |
In total, about 550 people have visited outer space and reached orbit as of November 2018 , and, of these, have walked on the Moon.
27| Attenborough also does a good job in showing viewers the intelligence that sea species have in the way they perfectly coordinate some of their attacks on their prey | Journal of the Atmospheric Sciences |
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| Earth's rotation period relative to the Sun—its mean solar day—is 86,400 seconds of mean solar time 86,400 | The Moon may have dramatically affected the development of life by moderating the planet's climate |
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