The number of pages it has, the number of words it contains, thickness of the book, weight of the book, time it takes to read it, etc.
Earthworms vary greatly in their length.
18 centimetre is one estimate.
Around twice as long as half it's length.
13-15 feet, trucks, vans and SUVs are longer
By a ruler 7inch.
About 4 millimeters
about 3 meters
You'd measure the length of a car in metres.
There is no standard measure. The monitor that I am using now is 71 cm long. Also, like TV screens, the size of a monitor is the length of its diagonal.
1244 ft at the crest
Miles or Kilometers
maybe about 1/4 of an inch
about 70feet long