Answer: the four terrestrial planets must once have been hot enough to be molten (like a liquid)
Explanation: Terrestrial planets can be defined as any planet of the solar system or any exoplanet which is "Earth-like" in the sense that it is composed primarily of metals and rock, in contrast to a planet which is a gas giant.
Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars.
Scientist believing that the densest, heaviest materials are at the center and not evenly distributed can be due to the fact that they must once have been hot enough to be molten. In this case, density will take place, making the heavier under and the lighter on top.
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ok so there is corona virus going around and another thing
people are protesting black lives matter
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Elements are substances that are made from one type of atom. An element cannot be broken down into any other substance. ... A mixture is made by simply mixing together elements and compounds. No new chemical bonds are formed.
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In the late 1980s, Mongolia had developed into an agricultural-industrial economy, but the inefficiencies of a centrally planned and managed economy and the example of perestroika in the Soviet Union led Mongolian leaders to undertake a reform program to develop the economy further.
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