The Earth’s core is cooling down very slowly over time. One day, when the core has completely cooled and become solid, it will have a huge impact on the whole planet. Scientists think that when that happens, Earth might be a bit like Mars, with a very thin atmosphere and no more volcanoes or earthquakes. Then it would be very difficult for life to survive – but that won’t be a problem for several billions of years.
Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin are all midwestern states
The thick layer is the-crust
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Our Sun rotates about the center of our Galaxy at 1000 years that is the answer to <span>What is the period of the Sun's orbital motion about the center of the Galaxy 1</span>000 years
