It's called the horizon. By definition, a horizon is the line where earth's surface appears to meet the sky. Horizon can also mean the limit to a person mental perception.
The imaginary line between the poles of the Earth around which the Earth spins is called the "axis of rotation".
The imaginary line between the poles of the Earth around which the Earth spins is called the "axis of rotation".
The imaginary line through Earth's poles is called the axis. It is an imaginary line that Earth rotates around.
There is no physical boundary between the northern and souther hemispheres. However, the imaginary line which is at 0o latitude is called the equator.
The sometimes magnesium rich Mohorovičić discontinuity, which often is called simply 'Moho', forms the boundary between the basalt rich crust and the planet's underlying, iron rich mantle.
The imaginary line that the Earth spins on is called the axis.
The imaginary line circling Earth halfway between the poles is called the Equator. It divides the Earth into the Northern Hemisphere and the Southern Hemisphere. The Equator has a latitude of 0 degrees.
The equator is an imaginary line that divides the world into two halves. It is also the boundary between north and south, each half is called a "hemisphere", one half being called the northern hemisphere, and the other half being called the southern hemisphere.
The imaginary line passing through the center of the Earth between the North and South Poles, around which the Earth rotates, is called the Earth's axis.
The Earth's Axis
The boundary between the mantle and core is called the core-mantle boundary. This region is marked by a significant change in density and composition, representing the transition from the solid mantle to the liquid outer core of the Earth.
The imaginary horizontal line that goes around the middle of the earth is called the equator.