Outer Planets (or Gas giants) –the planets outside of the asteroid belt. A gas has neither a defined shape nor volume. The mercury barometer was invented by Torricelli in 1643, followed by the invention of the mercury thermometer by Fahrenheit in 1714. The thin strips, most only a few miles wide, are made up of tiny bits of rock and ice smaller than a meter. 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. Venus is made up of a central iron core and a rocky mantle, similar to the composition of Earth. One Mercury year is equal to only 88 Earth days. They are much bigger than the rocky planets. A common example is ice. It can be all three states if you cool it down or heat it up enough. Of all the terrestrials, Mars is the closest analog to Earth. Mars: Fourth Rock from the Sun . Rocky planets are made mostly of rock and metal. A gas giant is a large planet composed mostly of gases, such as hydrogen and helium, with a relatively small rocky core. To understand what Saturn is made up, we have to know about the different types of planets. It is the most studied planet after Earth because of speculations that there might be water beneath the surface and its similarities to Earth. An example is liquid water. They are made of rocks and metals. 1. Mars is the fourth planet from the sun. Several exotic states also exist. The natural levels of mercury in the Earth’s crust vary from place to place, but average about 50 mg per tonne of rock. Mercury makes a complete orbit around the Sun (a year in Mercury time) in just 88 Earth days. 4.1 Mercury is released into the environment through both natural processes (e.g. The first use of a mercury alloy, or amalgam, as a tooth filling in dentistry was in 1828, although concerns over the toxic nature of mercury prevented the widespread use of this new technique. Mercury, Venus, Earth, Mars are made of rock and metal. Mercury is mined when present in cinnabar ores, which generally contain about 10 kg per tonne of rock . Mini-Neptunes have thick hydrogen–helium atmospheres, probably with deep layers of ice, rock or liquid oceans (made of water, ammonia, a mixture of both, or heavier volatiles). The other planets are not solid. Mercury can also evaporate to form an odorless, colorless, vapor. Mercury, Venus, Earth, and Mars are the rock planets. 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. 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 formed about 4.5 billion years ago when gravity pulled swirling gas and dust together to form this small planet nearest the Sun. Like its fellow terrestrial planets, Mercury has a central core, a rocky mantle and a solid crust. A solid has a defined shape and volume. Mercury is a liquid at room temperature, element #80. Gas planet facts. What are planets made of? Mercury is the smallest and closest planet to the sun in the Solar System.Its orbit around the Sun takes 87.97 Earth days, the shortest of all the planets in the Solar System. The core at Mercury’s center is mostly made up of iron and takes up about 75% of the planet’s radius. Mercury is a chemical element with the symbol Hg and atomic number 80. believe Pluto is made of rock, too. Plasma is the fourth state of matter. The three main states of matter are solid, liquid, and gas. The rings are composed of millions of small particles of rock and ice, each having its own independent orbit around the planet. Rocky planets are smaller than gas planets, but are made of heavier materials. 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