how does the last type of ship mentioned above carries cargo?
They carry all of their load in truck-size intermodal containers, in a technique called containerization.
Introduction
Container ships (sometimes spelled containerships) are cargo ships that carry all of their load in truck-size intermodal containers, in a technique called containerization. 
what was ss christopher columbus? An American excursion liner on the Great Lakes where is this lake situated? The upper mid-east region of North America which religions are practiced in that continent? Christianity, Atheism,  Buddhism what are the symbols associated with the first religion? The cross are there emblems like that symbol? Yes what was its significance in pre christian era? In the European Bronze Age the cross symbol appeared to carry a religious meaning, perhaps as a symbol of consecration, especially pertaining to burial. and what is its significance in christianity? UNANSWERABLE does the lake mentioned above has any sea transport connection to any ocean? Yes, the Great Lakes accessible to ocean-going vessels, shifts in shipping to wider ocean-going container ships
These are cargo ships that carry all of their load in truck-size intermodal containers. They carry all of their load in truck-size intermodal containers, in a technique called containerization. In truck-size intermodal containers, in a technique called containerization
Container ship Container ship Container ship
Introduction Introduction Introduction
Container ships (sometimes spelled containerships) are cargo ships that carry all of their load in truck-size intermodal containers, in a technique called containerization. Container ships (sometimes spelled containerships) are cargo ships that carry all of their load in truck-size intermodal containers, in a technique called containerization. Container ships (sometimes spelled containerships) are cargo ships that carry all of their load in truck-size intermodal containers, in a technique called containerization. They are a common means of commercial intermodal freight transport and now carry most seagoing non-bulk cargo.
wiki:19916194
Container ship [SEP] Introduction
Container ships (sometimes spelled containerships) are cargo ships that carry all of their load in truck-size intermodal containers, in a technique called containerization. They are a common means of commercial intermodal freight transport and now carry most seagoing non-bulk cargo. Container ship capacity is measured in twenty-foot equivalent units (TEU). Typical loads are a mix of 20-foot and 40-foot (2-TEU) ISO-standard containers, with the latter predominant. Today, about 90% of non-bulk cargo worldwide is transported by container ships, and the largest modern container ships can carry over 23,000 TEU (e.g., "MSC Gülsün"). Container ships now rival crude oil tankers and bulk carriers as the largest commercial seaborne vessels.