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4 de may. de 2024 · The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6 ) years. The geologic time scale or geological time scale ( GTS ) is a representation of time based on the rock record of Earth .
Hace 4 días · Geological history of Earth – The sequence of major geological events in Earth's past; Geodynamics – Study of dynamics of the Earth; Geosyncline – Obsolete geological concept to explain orogens; GPlates – Open-source application software for interactive plate-tectonic reconstructions
1 de may. de 2024 · Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. The similarities among all known present-day species indicate that they have diverged through the process of evolution from a common ancestor.
16 de abr. de 2024 · plate tectonics, theory dealing with the dynamics of Earth ’s outer shell—the lithosphere —that revolutionized Earth sciences by providing a uniform context for understanding mountain-building processes, volcanoes, and earthquakes as well as the evolution of Earth’s surface and reconstructing its past continents and oceans.
- German meteorologist Alfred Wegener is often credited as the first to develop a theory of plate tectonics, in the form of continental drift. Bringi...
- Although this has yet to be proven with certainty, most geologists and geophysicists agree that plate movement is caused by the convection (that is...
- The Ring of Fire is a long horseshoe-shaped earthquake-prone belt of volcanoes and tectonic plate boundaries that fringes the Pacific Ocean basin....
- Earth’s hard surface (the lithosphere) can be thought of as a skin that rests and slides upon a semi-molten layer of rock called the asthenosphere....
Hace 3 días · The early evolution of the solid Earth and its atmosphere and oceans is covered in geologic history of Earth. The geologic and biological development of Earth, including its surface features and the processes by which they are created and modified, are discussed in geochronology , continental landform , and plate tectonics .
- Earth is the third planet from the Sun and the fifth largest planet in the solar system in terms of size and mass. Its near-surface environments ar...
- Earth is located in the Orion-Cygnus Arm, one of the four spiral arms of the Milky Way, which lies about two-thirds of the way from the centre of t...
- Earth’s name in English, the international language of astronomy, derives from Old English and Germanic words for ground and earth, and it is the o...
- Earth and the other planets in the solar system formed about 4.6 billion years ago. The early Earth had no ozone layer and no free oxygen, lacked o...
- Viewed from another planet, Earth would appear bright and bluish in colour. In latitudinal belts, swirling white cloud patterns of midlatitude and...
Hace 6 días · In this chapter we will start at the very beginning, with a discussion of the Big Bang and the origin of the universe and our solar system. From there, we will investigate the formation of the Earth, and the reasons behind its interior and exterior structure. Finally, we will end the chapter by attempting to answer the question of how we can ...
3 de may. de 2024 · Paleozoic Era, major interval of geologic time that began 538.8 million years ago with the Cambrian explosion, an extraordinary diversification of marine animals, and ended about 252 million years ago with the end- Permian extinction, the greatest extinction event in Earth history.
