The Earth is Flat

Though I am posting this debate, it is in response to other debates and comments made by my opponent. Because it is generally accepted scientific, logical, and rational thought that the Earth is spherical in shape (though not a perfect sphere), my opponent asserts that the Earth is flat, and therefore the burden of proof is on him. Let me define "flat" as it is generally accepted in "flat Earth" philosophies. It is generally believed in "flat Earth" philosophies that the Earth is a plane. The North Pole is at the center of the Earth, and the outer limits of the Earth are "blocked" by a 150ft. wall in what we call Antarctica, and since noone has ever crossed that wall, noone can prove the Earth is NOT flat. I ask you the following. If the Earth is flat: -How do you explain volcanoes, magma, tectonic plates, earthquakes, geysers, and other phenomena which are easily explained by the scientific belief that the Earth is a sphere, has three major layers (crust, mantle, core [liquid outer, solid inner]), magma rises through the crust creating more crust, tectonic plates push against each other or float away from each other, etc. etc. etc.??? -How do you explain the belief that countries, companies, and even wealthy individuals have launched thousands of satellites into "orbit"? These satellites can be SEEN through telescopes, they lose energy and crash, they provide us with cell phone service, TV, internet, etc. so we know they are real. How do you explain their orbit? -How do you explain the countless pictures taken from Earth of similar planets, and of the Earth from space? How do you explain the apparent conspiracy that the earth is spherical perpetrated by various countries, companies, and wealthy individuals who have traveled to space? -How do you explain gravity? A flat surface doesn't create gravity, so the Earth being flat doesn't explain how we don't "float away" into space. How do you unexplain what science explains as the effect of one celestial body's gravitational pull over another like, for instance, the way the moon affects our tides? How do you explain (since you claim to know about wavelengths) the way white light bends through different points in the Earth's atmosphere? How do you explain the predictability of weather patterns, astrological phenomena like solar eclipses, lunar eclipses, and visible planet alignments visible from Earth as spheres (this relates to the assertion in science that Earth is similar to other celestial bodies in more ways than one)? -How do you explain the proven fact (through cross-world nautical expeditions, aeronautic feats, and orbital photographs) that an object that travels continuously forward around the Earth's surface does not significantly veer left or right (the sum of travel left subtracted from the sum of the travel right would equal zero) so it would be impossible to explain through a "flat Earth" theory how a plane, ship, or object in orbit can fly, sail, or circle in orbit East to West along the equator traveling from one point on the Earth to the same completely circling the Earth without ever veering north or south(numerically, because the sum of the mileage traveled north subtracted from the sum of the travel south equals zero; if the Earth were flat an object traveling west would have to continuously veer slightly right)? I humbly await your response...