Answer:
hot spots
Step-by-step explanation:
The earliest land on Earth formed as a result of the volcanic activity, or hot spot volcanism to be more specific. The hot spots managed to lift up the ocean floor with their activity, and gradually volcanic islands started to form. As these islands grew more and more because of the lifting up of the volcanoes, as well as the lava flows that they released, this started to merge, thus giving birth to the first continental land mass on Earth. The rocks that initially formed this first land mass are believed to have been ultramaffic because of the greater amount of heat that was present on Earth in that period of time.