why are manhole covers round

On Earth, the sky and the ground that we can see overlap with each other. This is because of the existence of the atmosphere, which forms a spherical encirclement that wraps the Earth in it. Therefore, we usually think of the earth as a spherical object. However, when photos were taken from space, due to the lack of an atmosphere, they usually showed the outline of the Earth instead of a complete sphere. This is due to the lack of atmospheric refraction and scattering of light in space, so the light can directly pass through the surface of the Earth and form an outline in the photo. Although the Earth is not exactly spherical in shape, we can see the outline of the Earth in pictures taken in space, rather than a complete sphere.

Some romance novel covers might seem bad because they use clich茅d or cheesy images that don't do justice to the depth of the story.

Well, it's often to clearly identify the genre of the book. By stating 'a novel', readers immediately know what kind of literary form they're dealing with.

" Underneath the Legends of the Underground World " is a light novel written by the author every night. It's a derivative Doujinshi novel. The general plot of this novel is as follows: A long time ago, Earth was ruled by two races, humans and monsters. One day, the war drums shattered the peace between the two sides, and under the human's almost massacring invasion, the humans won a complete victory. The humans drove the monsters underground and set up a powerful magic barrier to trap the monsters underground at the foot of Mount Ipot. Legend had it that no human who had climbed Mount Ipot had ever returned alive. In the year 201X, a human girl climbed up Mount Ipot and found a big hole. However, she accidentally tripped on a vine and fell into the hole… ---------------------------- " Alien Prison Battlefield " was a fantasy novel written by the author, Shu Huo Liaoyuan. The general plot of this novel was: "Do you know hell?" " Actually, this hell isn't quite the same as what you imagine…" He had lost his memories of his personal identity, awakened in an extremely bizarre world, had a home that could shrink at any time, a well that could level up by absorbing souls, and fought non-stop in order to survive because he had no other choice... ---------------------------- The Catacombs Game: I Can Kill Monsters and Obtain Attributes was a novel written by the author, Three Dreams of Child's Words. The general plot of the novel was: When he descended into the Catacombs world, monsters were everywhere. The world seemed to be made up of rooms. Everyone had a shovel in their hands that was used as a key. By digging, they could reach the next Catacombs. "However, you will never know what kind of danger lies in the next Catacombs. In this dark world, sometimes a demon was not necessarily a monster…Book Group: 319590627. ---------------------------- The book," Pit ", was a modern romance novel written by the author, Xin 'er Huan Chang. The general plot of the novel was: We were all born as angels, but our life experiences would leave marks on us, and even poke holes in us. Thus, we began a long journey of self-healing. On the journey, we would meet all kinds of people and have all kinds of stories. ---------------------------- " Survival in the Catacombs: I Can Hear the Prompt " was a sci-fi novel written by Scholar Bai Cai. The general plot of the novel was: "There's a traveler's backpack in the Catacombs ahead. There might be a surprise hidden in the backpack." "There's a hungry beast in the cave on the left. Trust me, you definitely don't want to face it." " The underground cave under your feet leads straight to lava. If you want to take a hot bath in the raging fire, you can try digging." When they woke up, billions of people around the world were in sealed Catacombs. The first step was to use a shovel, and the resources were all dug up. However, not only were there resources in the Catacombs, but there were also many terrifying monsters. No one could guarantee whether they would encounter resources or ferocious beasts after they dug into the next Catacombs. However, Yu Cheng realized that he could hear the notification sound. He knew in advance what was in the next Catacombs. Therefore, while others were still struggling between life and death, struggling to survive for a bite of food. Yu Cheng, on the other hand, was already carrying a shovel and running around freely, frantically searching for resources…Book friend group: 820139048. ---------------------------- Extreme Zone was a mystery novel written entirely by the author. The general plot of the novel was: Everything started when I was six years old. What was hidden under the mine? What did I see with my own eyes? The sudden rat tide in the mine and the sudden earthquake in the Kuangqu completely changed the fate of every survivor. A mysterious veil is about to be lifted. Please follow me and experience a soul-stirring path of survival! ---------------------------- I Am the Well Dragon King of the Human World was a Xianxia-Cultivation civilization novel written by the author, Jin Xiu Hui. The general plot of this novel was: The mountain is not high, there are immortals will be famous. The water wasn't deep, and loaches were fine. Loach is a fallen dragon. It has no dragon shape, no dragon shape, and no dragon life. When the wind and clouds rose, he could also create clouds and spit fog, summon the wind and rain, reverse the changes of darkness and light, hide the meson to hide his form. He even relied on his ability to dig holes to dig through the celestial heavens and the underworld, allowing a human well to connect the four seas, the eight poles, and the heavens and the earth... ---------------------------- " 9,000 Meters Underground " was a suspense-adventure survival novel written by the author, Ant Mengmeng. The general plot of the novel was: The interior of the earth was hollow. As long as one could find some special passages, they could enter the mysterious core world. There were dense plants and pleasant climate there… ---------------------------- The Catacombs World: I am the King of the Catacombs was a fantasy novel written by the author, Cold Ronin. The general plot of the novel was: In the future world, humans would retreat to the Catacombs and build cities in the Catacombs. The Catacombs would become their last home! The threat of the other races in the Catacombs! All kinds of unbelievable phenomena happened! The search for resources was fraught with danger! How could weak humans survive? Su Xiao had transmigrated and created his own legend in the Catacombs step by step! ---------------------------- The book " Descending into the Abyss Era " was a sci-fi futuristic novel written by the author, A Bamboo Desert. The general plot of this novel was: When the development of science and technology seemed to have encountered a bottleneck, when the Nine Stars aligned again, when the Abyss descended, countless people were dragged into the Abyss. As a result, countless races hidden deep in the universe gradually emerged. The lost civilizations of Earth emerged in the Abyss one by one. The lost island Atlantis civilization, the sunken Gendaya civilization, the Mizobudaya civilization with magnetic field conversion, the flooded Muria civilization, and the strange world of light recorded in the Classic of Mountains and Seas... When one truly entered the Abyss and saw the vastness of the universe, the existence of the countless Abyss spread a legend. " Only those who walk out of the Abyss can enter the Abyss Era!

The ninth and tenth rounds of the Romance of the Three Kingdoms mainly told the story of Cao Cao and Liu Bei in the Battle of Changban Slope. In the ninth round, Cao Cao led his army to attack Liu Bei's camp but was stopped by Liu Bei's troops. Cao Cao used fire to attack but was discovered and repelled by Liu Bei's troops. After that, Cao Cao launched a fierce attack, but Liu Bei's troops held on without fighting. In the tenth round, Cao Cao personally led the cavalry to charge at Liu Bei's position in an attempt to launch a surprise attack. However, Liu Bei's troops were already prepared for Cao Cao's defeat. In the process of retreating, Cao Cao was chased by Liu Bei's troops and eventually fled to Wulin. After that, Cao Cao was defeated by Sun Quan again in the Battle of Red Cliff and eventually fled to Hefei. However, Cao Cao was regarded as a powerful statesman and strategist during the Three Kingdoms period. His military and political talents were praised by later generations.

Publishers might do it to attract more readers. They think a flashy or misleading cover will catch people's eyes on the bookstore shelf. For example, a cover with a beautiful love - story - like scene might be used for a book that has a more complex and dark plot inside.

Well, it could be due to various reasons. Sometimes, the designers might not have enough creativity or experience. Or perhaps the publishers don't invest enough in good cover design.

Well, one reason could be to attract different age groups or reader interests. Different covers might catch the eye of various types of readers.

The shape of Tang Sanzang in Journey to the West was not clearly described. It was impossible to determine whether he was a round or flat figure. In Journey to the West, Tang Sanzang was a great Buddhist monk. He was usually depicted as tall, dignified, with a round head, long fluffy hair, and a kind smile on his face. However, the shape of Tang Sanzang's body was not limited to this. His body may be slightly thin, but it was not specifically described as a round or flat figure.

The size of the dining room and the number of people in the family had to be taken into account when choosing a round table. According to the information provided, the round table had a higher requirement for the size of the restaurant. It was best to be close to a square or large enough. If the dining room was small, a long table would be more suitable. In addition, the number of people in the family was also a factor to consider when choosing a round table. If there were only two or three people, it would be a little awkward to have a big round table. If both parents lived together or had relatives and friends who often came to eat at home, a big round table was the first choice. As for the size of the round table, the diameter of the small round table for 2-3 people was about 1 meter, the diameter for 4-6 people was about 1.2, and the diameter for 6-8 people was about 1.4. In short, the size of the restaurant and the number of people in the family would determine the right round table.