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There are four rocky planets in our Solar System: Mercury, Venus, Earth, and Mars. This piece of modern art, made from mercury sulfide, hangs on the wall at the DELA recycling company in Dorsten, Germany. [/caption] Mercury is the closest planet to the Sun, orbiting at only 57.9 million km. High-level exposure to methylmercury is known as Minamata disease. Early in the history of the solar system, while planets such as Venus were forming, the cloud of dust and rock orbiting the sun was a chaotic place. Many atoms in Mercury’s surface rocks and in its tenuous atmosphere become ionized when struck by energetic particles in the solar wind and in Mercury’s magnetosphere. Mercury has proved useful for measuring devices such as thermometers, but is toxic to humans and animals. To understand what Saturn is made up, we have to know about the different types of planets. Information about Mercury's composition is based on data from the spacecraft Mariner 10, launched in 1973, and the probe MESSENGER, the mission for which ran from 2011 to 2015. The natural levels of mercury in the Earth’s crust vary from place to place, but average about 50 mg per tonne of rock. The gas giants of our solar system are Jupiter, Saturn, Uranus and Neptune. Mercury as an element has many industrial uses, as it is the only metal that is a liquid at room temperature. They each have many moons. Gas planet facts. Planemo One day on Mercury (the time it takes for Mercury to rotate or spin once with respect to the stars) takes 59 Earth days. After Mariner 10 made three flybys of Mercury in the 1970s, its strange composition, including the bulky iron core, led to a wealth of theories about how the planet may have formed. The outer planets are Jupiter, Saturn, Uranus, and Neptune.. Terrestrial Planet is a planet that is made mostly of silicate rocks or metal, with a solid surface. Venus is made up of a central iron core and a rocky mantle, similar to the composition of Earth. They are much bigger than the rocky planets. Mercury is a chemical element with the symbol Hg and atomic number 80. A common example is ice. Of all the terrestrials, Mars is the closest analog to Earth. Gas giants usually have a solid core, but the rest is totally made of gas. Mercury is only slightly larger than the Earth’s moon. Once released, mercury enters air, water and soil, and moves from one to another until it … Author: Fabian Schmidt / sad Date 15.01.2013 Mars is also known as “the Red Planet” because its surface is reddish in color. They have a hot core surrounded by a layer of hot rock called the mantle. Earth is a solid planet, although we have a gaseous atmosphere. Earth and the other three inner planets of our solar system (Mercury, Venus and Mars) are made of rock, containing common minerals like feldspars and metals like magnesium and aluminum. What are planets made of? Saturn’s most prominent feature is its rings, first observed by Galileo in 1610. On the periodic table, it has the symbol "Hg" and its atomic number is 80. The magnetic field of Mars is very weak, and there's a thin, carbon-dioxide atmosphere. Mercury, Venus, Earth, Mars are made of rock and metal. Mercury, Venus, Earth, and Mars are the rock planets. Inner Planets (or Terrestrial Planets) – the planets inside of the asteroid belt. A liquid has a defined volume, but can change state. mining, fuel use, products and processes). Its atmosphere is mainly made up of carbon dioxide (96%) and … Mercury is the smallest of the eight planets and is closest to the sun. Rocky planet facts. The lower layer is made up of the liquid hydrogen which may become metallic just above the core. Rocky planets are smaller than gas planets, but are made of heavier materials. There might be a small bit of rock making up their core but the majority of them is made of gas. Mars is the fourth planet from the sun. The first and largest gas giant in our solar system is Jupiter, with a radius almost 11 times the size of Earth.Currently, it has 50 moons and 17 more satellites waiting for confirmation from NASA.. Mercury formed about 4.5 billion years ago when gravity pulled swirling gas and dust together to form this small planet nearest the Sun. Gas giants are sometimes known as failed stars because they contain the same basic elements as a star. A gas giant is a large planet composed mostly of gases, such as hydrogen and helium, with a relatively small rocky core. The amount of mercury mined with the ores is too insufficient to mention Mercury as an ore, although its occurrence is always with other mercury ores. 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