does this help? seafloor spreading. Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection.
Explanation: Dont worry about it,
Water erosion is the main cause which is the loss of topsoil due to water.
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New Zealand’s cultural influences are predominantly European and Maori. Immigrant groups have generally tended to assimilate into the European lifestyle, although traditional customs are still followed by many Tongans, Samoans, and other Pacific peoples.
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