Question

Mention any two theories of Origin and Evolution of Earth.

Answer 1

In his The Origin of Life, Oparinargued that a "primordial soup" of organic molecules could be created in an oxygen-less atmosphere through the action of sunlight. These would combine in ever-more complex fashions until they formed droplets.

Answer 2

1st

Life began at deep-sea vents

The deep-sea vent theory suggests that life may have begun at submarine hydrothermal vents spewing key hydrogen-rich molecules. Their rocky nooks could then have concentrated these molecules together and provided mineral catalysts for critical reactions. Even now, these vents, rich in chemical and thermal energy, sustain vibrant ecosystems.

2nd

There are two fundamental theories regarding the formation of the solar system, Nebular Hypothesis or Gas Collapse and the Accretion Disk Model.