I'm not totally sure about this one but it sounds like symptoms of borderline personality disorder. Hope I could help.
Scientists can determine the age of the seafloor by watching the constant changing magnetic field of our planet. When it cools down, it records the magnetic field during its formation. The two parts of the oceanic plate are pulled apart, and magnetic stripes become older as they move away from the mid-ocean ridge. Hope that helps!
By adding taxes on the goods being carried by traders. Kingdoms would often thrive on taxes. Taxes would often come in form of goods or weapons. In most cases, food always used to pay for the services. This is because of the growing agricultural sector of many civilizations
