Why do I have to talk about this? Seriously, I think this is a leftist trope but it actually works here. It is 2017. Seriously, we have known this since ancient Greece, well over 2,000 years. Then again, this is 2017 and we have the internet and there is no other place for dumb ideas to percolate than the internet. Look no further than the socialist community. Here are three simple proofs to disprove the ludicrous flat earth theory.
You can see satellites from the surface at night rotating around the earth. Under flat earth theory, this should not be happening.
2. Great lakes
If flat earth theory was correct than large bodies of water should not cut the bottom out of structures like buildings and ships off, especially in any significant way, but we can clearly see they do. Structures should get smaller but proportionally smaller but we can clearly see they do not. They slowly drop beneath the horizon part by part. Look no further than the Chicago Skyline and Lake Michigan. In the picture below, you can clearly see the top but the bottom is cut off. I have also provided a picture of the full skyline.
Did you know you can see the center of the earth? You can, you just need to use seismic waves. When traveling through the earth’s core, seismic waves are affected by the core. Going through the core will change the velocity of the waves and those changes allow us to see the core. A core means we are a sphere and this destroys flat earth theory.