Request a Copy of your Certificate of Naturalization. The Certificate of United States Naturalization Guide was developed to help naturalized U.S. citizens complete and file their own requests for a copy of their Certificate of Naturalization.
A polar day refers to a day when the sun does not set for 24 hours. This occurs because the top of the earth tilts toward the sun during one half of the year. Areas in the very northern and very southern parts of the globe are the only regions that experience both polar days and polar nights.
1 Earth's orbit-Changes in the Earth's orbit (called Milankovitch cycles) can cause the Earth to be closer to the Sun (warmer) or further from the sun (colder). 2  Ice ages can occur when we are further from the Sun. 3  Sun-The amount of energy output by the Sun also changes.