Question

people believed that the earth was flat​

Answer 1

those type of people are uneducated or we can't say that type of people are uneducated which are suffering from mantle problems

Answer 2

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Members of the Flat Earth Society claim to believe the Earth is flat. Walking around on the planet's surface, it looks and feels flat, so they deem all evidence to the contrary, such as satellite photos of Earth as a sphere, to be fabrications of a "round Earth conspiracy" orchestrated by NASA and other government agencies.

The belief that the Earth is flat has been described as the ultimate conspiracy theory. According to the Flat Earth Society's leadership, its ranks have grown by 200 people (mostly Americans and Britons) per year since 2009. Judging by the exhaustive effort flat-earthers have invested in fleshing out the theory on their website, as well as the staunch defenses of their views they offer in media interviews and on Twitter, it would seem that these people genuinely believe the Earth is flat.

Flat-earth believers are not relegated to the hidden corners of the universe: Plenty of celebs have been quite vocal with their beliefs. For instance, on Jan. 25, 2016, rapper-singer Bobby Ray Simmons Jr. (known as B.o.B) released a track called "Flatline" in which he disses astrophysicist Neil deGrasse Tyson, after the two had a Twitter battle over the spherical-ness of the planet. B.o.B is convinced Earth is flat. A day earlier, the rapper tweeted: "No matter how high in elevation you are... the horizon is always eye level ... sorry cadets... I didn't wanna believe it either."

And then there's Shaq. In a podcast that aired on Feb. 27, 2017, former NBA player Shaquille O'Neal proclaimed our home planet is flat, saying that when he drives from Florida to California "it's flat to me." Shaq later said he was just kidding. [5 Scientific Rebuttals of Shaq's Flat-Earth Claims]

Some believers have gotten creative in their quest to prove a flat planet: Conspiracy theorist D. Marble posted on YouTube on May 1, 2017, that he brought a spirit level aboard a flight from Charlotte, North Carolina to Seattle, Washington, to see whether the plane's nose would dip to "compensate for curvature" of the Earth, he said. On the video, he said: "I recorded a 23 minute and 45 second time-lapse, which by those measurements means the plane travelled a little over 203 miles. According to Spherical Trigonometry given to explain the Heliocentric model, this should have resulted in the compensation of 5 miles of curvature. As you'll see there was no measurable compensation for curvature." (The air bubble in his level remained centered, which he said proves the Earth is flat.)

$\textit{Hope this helps you}$

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