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teori pembentukan bumi

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Teori Laurasia-Gondwana Eduard Zuess  dalam bukunya  The Face of the Earth  (1884) dan  Frank B. Taylor  (1910) mengemukakan teorinya bahwa pada mulanya terdapat dua benua di kedua kutub bumi. Benua-benua tersebut diberi nama  Laurentia   (Laurasia)  dan  Gondwana . Kedua benua itu kemudian bergerak secara perlahan ke arah ekuator sehingga terpecah-pecah membentuk benua-benua seperti sekarang. Amerika Selatan, Afrika, dan Australia dahulu menyatu dalam Gondwanaland, sedangkan benua- benua lainnya menyatu dalam Laurasia. Teori Laurasia-Gondwana diyakini oleh banyak ahli karena bentuk pecahan-pecahan benua tersebut apabila digabungkan dapat tersambung dengan tepat. Namun, penyebab pecahnya benua-benua tersebut belum dapat ditemukan.  Teori konveksi Teori konveksi mengemukakan bahwa terjadi aliran konveksi ke arah vertikal di dalam lapisan astenosfer yang agak kental. Aliran tersebut berpengaruh sampai ke kerak bumi yang ada ...
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facts about outer planets

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Facts About Outer Planets Jupiter Facts Jupiter  size compared to  Earth Jupiter  distance from the  Sun  and orbital eccentricity Jupiter is the fourth brightest object in the solar system. Only the Sun,  Moon  and  Venus  are brighter. It is one of five planets visible to the naked eye from Earth. The ancient Babylonians were the first to record their sightings of Jupiter. This was around the 7 th  or 8 th  century BC. Jupiter is named after the king of the Roman gods. To the Greeks, it represented Zeus, the god of thunder. The Mesopotamians saw Jupiter as the god Marduk and patron of the city of Babylon. Germanic tribes saw this planet as Donar, or Thor. Jupiter has the shortest day of all the planets. It turns on its axis once every 9 hours and 55 minutes. The rapid rotation flattens the planet slightly, giving it an oblate shape. Jupiter orbits the Sun once every 11.8 Earth years. From our point of view on...
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facts about the universe

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facts of universe The Universe Is Getting Bigger NASA, ESA, E. Jullo (JPL/LAM), P. Natarajan (Yale) and J-P. Kneib (LAM) The Universe's Growth Spurt Is Accelerating In the 1920s, astronomer Edwin Hubble made the revolutionary discovery that the universe is not static, but rather is expanding. But, it was long thought that the gravity of matter in the universe would slow this expansion or even cause it to contract. In 1998, the Hubble Space Telescope studied very distant supernovas and found that, a long time ago, the universe was expanding more slowly than it is today. This puzzling discovery suggested that an inexplicable force, called dark energy, is driving the accelerating expansion of the universe. [ Full Story ] While dark energy is thought to be the strange force that is pulling the cosmos apart at ever-increasing speeds, it remains one of the greatest mysteries in science because its detection remains elusive to scientists. NASA, ESA, the Hub...
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