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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Once you are finished, your card is registered and activated. 3. Call Green Dot by telephone to register and activate your temporary MasterCard by phone. The hours of operation are 8 a.m. to 1 p.m. Monday through Friday, and 8 a.m. to 10 p.m. Saturday and Sunday (Eastern Time). The number is 866-785-6963. Say register a card when prompted or press 1..