Things that are natural are not made by people and they occur naturally in the environment. Things that are manufactured are built by people and are mostly modelled after natural structures. Natural and manufacture are both opposites to each other.
Natural structures are formed by themselves whereas man made structures are built to look like something ...
Engineered structures are man-made constructions designed and built for specific purposes, such as bridges, buildings, dams, and tunnels. These structures are usually planned, analyzed, and constructed by engineers to withstand loads and environmental conditions while serving their intended function.
The difference between build and built is that build is the present tense (or if you make it to build, the infinitive tense) and built is the past tense.
Caves and rock shelters are natural formations that provide shelter for humans and animals, while houses are man-made structures built for the purpose of living. Caves and rock shelters typically require minimal construction and are often used for temporary shelter or storage. Houses are more permanent structures that are built according to human needs and preferences, and usually have amenities for comfort and security.
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There really is no difference
Natural levees are built up over time from debris and sediment whereas artificial levees are man made using sand bags and larger rocks.
ancient structures were built by man not screws
These two terms are often used interchangeably to refer to the short, shore perpendicular structures that are built along a shoreline to hold sand in place. However, technically speaking, groins and jetties are not the same thing. Groins are the smaller shore perpendicular structures, built to trap sand and stabilize a sandy beach. Jetties are large structures typically used to stabilize inlet channels.
one is faster, one is longer.
A made structure can mean any structure or building that are not natural but were made either by humans or animals. Samples of made strucutres : * Mounds built by termites * Eiffel Tower * The Hubble Telescop Samples of natural structures : * Mountains * Canyions