The frigid zone line, also known as the Arctic Circle in the Northern Hemisphere and the Antarctic Circle in the Southern Hemisphere, is an imaginary line on the globe that represents the boundary of the frigid zone. This line is one of the five major lines of latitude that divide the Earth into different climate zones.

**What are Globe Latitudes and Longitudes?**

Globe latitudes and longitudes are a system of imaginary lines that help us locate any point on the Earth's surface. Latitude lines are parallel to the equator and measure the distance north or south of it. On the other hand, longitude lines, also known as meridians, are vertical lines that intersect at the North and South Poles and measure the distance east or west of the Prime Meridian.

**The Frigid Zone Line**

The frigid zone line is located at approximately 66.5 degrees north latitude in the Northern Hemisphere and 66.5 degrees south latitude in the Southern Hemisphere. It marks the boundary of the frigid zone, which is the region of the Earth's surface that experiences extremely cold temperatures and long periods of darkness or daylight depending on the season.

**Arctic Circle (Northern Hemisphere)**

In the Northern Hemisphere, the frigid zone line is known as the Arctic Circle. It passes through several countries, including Canada, Greenland, Russia, Sweden, Norway, and the United States (Alaska). North of this line, during the winter months, the sun does not rise above the horizon for at least one day (polar night), while during the summer months, the sun does not set for at least one day (midnight sun).

**Antarctic Circle (Southern Hemisphere)**

In the Southern Hemisphere, the frigid zone line is known as the Antarctic Circle. It encircles the continent of Antarctica and marks the southernmost point where the sun can be seen above the horizon on the winter solstice (shortest day) and below the horizon on the summer solstice (longest day).

**Climate and Wildlife in the Frigid Zone**

Due to the extreme cold temperatures, the frigid zone has a unique climate and wildlife. The region is covered by ice and snow for most of the year, making it difficult for plants and animals to survive. However, some species, such as polar bears, penguins, and Arctic foxes, have adapted to these harsh conditions and thrive in the frigid zone.

In conclusion, the frigid zone line, represented by the Arctic Circle in the Northern Hemisphere and the Antarctic Circle in the Southern Hemisphere, marks the boundary of the frigid zone. This line is one of the important lines of latitude on the globe and helps us understand the unique climate and wildlife found in this extreme region of the Earth.

The frigid zones lies near the poles. The climate in the polar regions is very cold that is why the area is known as the frigid zone.