Definition: Abbysus, or abyssal plain, is a term used in geology to describe an area of rock where the temperature is extremely cold and the pressure is intense. It is located on Earth's surface near the poles, and it is often associated with extreme temperatures, such as subzero temperatures. The term "abyssus" comes from the Greek word "abysmós," which means "earthquake ground." This term refers to the area of rock where the temperature can become extremely cold and the pressure high enough that there could be a complete vacuum. This is because the Earth's crust is made mostly of iron and nickel, and as an earthquake occurs in this region, it creates a powerful shock wave that causes the metal to break, releasing vast amounts of energy into the atmosphere. The term "abyssus" has been used by geologists for many years, and its definition varies depending on how far into the Earth one is measuring. Some have defined abysmal as being located at the base of the mountain range known as the Andes, while others may use it to describe a region where temperature drops extremely low. In general, "abyssus" refers to an area of extreme cold and intense pressure in the Earth's crust. It is often used by geologists and scientists to study the Earth's crust and understand its geological history.

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