The average density of Earth is 5,515 kg/m3. Since the average density of surface material is only around 3,000 kg/m 3, we must conclude that denser materials exist within Earth's core.
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Nationstar Mortgage Mail to: Nationstar Mortgage P.O. Box 650783 Dallas, TX 75265-0783. Nationstar Mortgage Customer Service. The customer service phone number for mortgage, as you already know, is 1-888-480-2432. This phone number is available Monday through Thursday between 8:00 am and 8:00 pm CST, and Friday between 8:00 am and 6:00 pm CST.