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Question 1: over 4.5 billion years all the above
Question 2: all the above
Question 3: The force of gravity pulled more and more material into the center of this swirling disk. Eventually, the pressure in the center was so great that hydrogen atoms began to combine and form helium, releasing a tremendous amount of energy.
Question 4: core is made up of heavy elements, such as iron and nickel, and lighter elements, such as potassium and sodium make up the surface.
Question 5: The process through which distinct layers with characteristic chemical and/or physical properties are formed
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d people with disabilities.
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In works of art, macabre is the quality of having a grim or ghastly atmosphere. The macabre works to emphasize the details and symbols of death.
Common sense - a book to persuade people to rally colonists around the idea of independence or to fight
