What made it possible for life to appear on land?

Several factors played a role in the emergence of life on land: the first is the salinity of water due to volcanic eruptions, the second is the presence of an atmosphere, and the third is the presence of a large number of plants. Due to volcanic eruptions and the mixing of lava and volcanic gases, the waters of the oceans began to be saturated with sulfur and carbon dioxide. Marine organisms coped with the lack of oxygen in the water when they came ashore. At that moment, the plants accumulated a huge amount of oxygen, and a single lightning turned the Earth into a flaming ball, creating an atmosphere suitable for living organisms.