See full cheat sheet. 1  1 Steel mesh: Material made of interlaced steel bars or wire, welded together, used to reinforce concrete. 2  2 Concrete slab: A flat area of concrete that can be used for a variety of purposes, such as a patio or a driveway. 3  3 Grading: The process of evening out the ground's surface, making it either flat or sloped.
Earth's circumference (the distance all the way around the equator) is 24,901 miles (40,075 kilometers). Its diameter (the distance from one side to the other through Earth's center) is 7,926 miles (about 12,756 kilometers). Earth is slightly smaller when measured between the North and South Poles which gives a diameter of 7,907 miles (12,725 kilometers). Earth bulges out a bit more around the equator than around the poles because of its rotation (spin).
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers). But, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This means the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).