What god presided over earthquakes, horses, and the sea?

The correct answer is Poseidon, also known as Neptune in Roman mythology, because he is the god specifically associated with the sea, horses, and earthquakes. In ancient mythology, Poseidon was one of the Olympian gods and the brother of Zeus and Hades. He wielded a trident and had the power to create storms and earthquakes, making him a significant deity for sailors and those who relied on the sea for their livelihood.

Horses were also closely linked to him; in fact, he is often credited with creating the first horse, solidifying his connection to equine species. This multifaceted domain encompassing water bodies, seismic activity, and equestrian aspects clearly distinguishes Poseidon as the correct answer for this question, reflecting his vital role in ancient Greek culture as a powerful and influential god.