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(110–210 Earth radii) 6.36×10 6 –1.27×10 7: The space dominated by Earth's magnetic field and its magnetotail, shaped by the solar wind. [17] Earth's orbit: 299.2 million km [b] 2 AU [c] 2.99×10 8: The average diameter of the orbit of the Earth relative to the Sun. Encompasses the Sun, Mercury and Venus. [18] Inner Solar System ~6.54 AU ...
The Cascade Range made its first appearance 36 million years ago, but the major peaks that rise up from today's volcanic centers were born within the last 1.6 million years (during the Pleistocene). More than 3000 vents erupted during the most recent volcanic episode that began 5 million years ago.
Sevier orogeny – Mountain-building episode in North America – Rocky Mountains, western North America, (140–50 Ma) Laramide orogeny – Period of mountain building in North America – Rocky Mountains, western North America, (40–70 Ma) Pasadena orogeny – Transverse Ranges, western North America, Pleistocene Period to present day
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Earth's rotational velocity also varies in a phenomenon known as length-of-day variation. [171] Earth's annual orbit is elliptical rather than circular, and its closest approach to the Sun is called perihelion. In modern times, Earth's perihelion occurs around 3 January, and its aphelion around 4 July.
A map of Earth's plate tectonics. This episode explores the palaeogeography of Earth over millions of years, and its impact on the development of life on the planet. Tyson starts by explaining that the lignin-rich trees evolved in the Carboniferous period about 300 million years ago, were not edible by species at the time and would instead fall over and become carbon-rich coal.
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Today After 17 years, Hoda Kotb is officially bidding farewell to the Today show. Kotb, 60, appeared on her final episode of the NBC morning show on Friday, January 10. The day started off on a ...