Earth / Planet Earth
The Boring Billion, otherwise known as the Barren Billion, the Dullest Time in Earth’s History, and Earth’s Middle Ages, is the time period between 1.8 and 0.8 billion years ago (Gya) spanning the middle Proterozoic eon, characterized by more or less tectonic stability, climatic stasis, and slow biological evolution. Summary It is bordered by two […]
Space Exploration Technologies Corp. (doing business as SpaceX) is an American aerospace manufacturer, space transportation services and communications corporation headquartered in Hawthorne, California. SpaceX was founded in 2002 by Elon Musk with the goal of reducing space transportation costs to enable the colonization of Mars. SpaceX manufactures the Falcon 9 and Falcon Heavy launch vehicles,
The geometer moths are moths that belong to the insect order Lepidoptera, which includes moths and butterflies. Their scientific name is derived from the Ancient Greek geo and metron meaning “measure” in allusion to how their larvae, or “inchworms,” appear to “measure the earth” as they crawl in a looping form. It is a fairly
Insects (from Latin insectum) are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms. The total number of extant species is estimated at
Oxygen (O) is a chemical element with atomic number 8 and symbol O. It is a highly reactive non-metal and a member of the chalcogen group in the periodic table. Oxygen is essential for life on Earth, forming the basis of cellular respiration in aerobic organisms and participating in numerous chemical and industrial processes. About
Battery Tynes is a historic artillery battery in Charleston, South Carolina, located on James Island. It was erected in 1863 to defend the upper Stono River and the bridge between James Island and Johns Island, South Carolina. The earthen redoubt is about 320 feet long and 180 feet deep. It features a parapet wall 10â20
Europe is a continent that lies fully in the Northern Hemisphere and primarily in the Eastern Hemisphere. It consists of the westernmost peninsulas of Eurasia’s continental landmass, shares the continental landmass of Afro-Eurasia with both Asia and Africa, and is bounded by the Arctic Ocean to the north, the Atlantic Ocean to the west, the
Continental drift is the theory that the Earth’s continents have shifted relative to one another during geologic time, giving the impression that they have “drifted” over the ocean floor. Abraham Ortelius proposed the theory that continents ‘drifted’ in 1596. Alfred Wegener separately and more extensively established the notion in 1912, but his hypothesis was dismissed
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The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid. The term elevation is mainly used when referring to points on the Earth’s surface, while altitude or geopotential height is used for points above the surface. Elevation is not to be confused with the
The Americas, which are also collectively called America, are a landmass comprising the totality of North and South America. The Americas make up most of the land in Earth‘s Western Hemisphere and comprise the New World.