The answer is: The sea
Back then, the techology that exist to travel by sea was not as developed as it is today. If an empire decided to travel through the sea in order to do some conquests, that empire will risk several things, such as:
- Loss in directions
- The ships could be swallowed by harsh wheather in the middle of the sea
- It need a lot of resources to maintain the armies during the travel
<span>President Franklin D. Roosevelt</span>
<span><span> 1.Hadean eonsometimes called Age of Mammals </span><span>2.Archean eontoxic atmosphere; first bacteria </span><span>3.Proterozoic eonbuildup of oxygen first eukaryotes </span><span>4.Phanerozoic eoncurrent eon </span><span>5.Paleozoic eratime of the dinosaurs </span><span>6.Mesozoic eralargest mass extinction in Earth's history </span><span>7.Cenozoic era<span>formation of the solar system</span></span></span>
Answer:
Example: Galileo and Copernicus
Explanation:
Copernicus had come up with the idea of heliocentrism. Back then, everyone had believed the other planets revolved around the Earth, but Copernicus had done the math and realized the Earth and everything else revolved around the Sun. The Sun was the center of our solar system, not the Earth. But because he was accused of blasphemy from the Catholic church, he didn't share his ideas until his book published right before he died. Years later, Galileo took his idea, observed and researched, and found evidence backing Copernicus's theories. That's why today we know the truth about how the Sun is at the center of everything. Galileo built on Copernicus's discoveries and ideas, found evidence, and proved it was true.
