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Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere
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e.surfaces dramatically altered during the heavy bombardment
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That would be the tectonic plates.
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Secondary sources : The data which are found from individual person, organizations, agencies, books, journals, magazines, annual reports, etc. are secondary sources of population data.
