What is the general meaning of the prefix "geo-" when used in various terms?

The prefix "geo-" originates from the Greek word "geō," which means "earth." This prefix is commonly used in a variety of terms related to Earth sciences, geographical studies, and anything pertaining to the planet itself. For instance, words like "geography," which refers to the study of Earth's landscapes, and "geology," the study of Earth's physical structure and substance, both illustrate the connection to the Earth that the prefix signifies. The association of "geo-" with concepts relating to land, terrain, and the physical characteristics of our planet clearly supports that its general meaning is indeed "earth."

In contrast, the other prefixes represent different elements: "aqua-" relates to water, "bio-" pertains to life, and "pyro-" connects to fire. While each of these prefixes holds significance in their respective contexts, none reflects the terrestrial focus that "geo-" embodies, solidifying why it is the correct choice in relation to meanings tied to the Earth.