What finally enabled sturdy skyscrapers was sturdy steel, which is a mixture of metals and other elements, such as carbon, which is distinguished by low cost on one hand and strength and flexibility on the other.
An advantage of using a river as boundary is that its creates a clear line which made the boundary very solid and indisputable.
<h3>What is a
boundary?</h3>
A boundary means a land location that differentiate the extent of the territory of two or more country, state, city, town etc
Some region were able to use river as boundary because of its presence whereas some region without river may use a structure to show the boundary.
Hence, the advantage of using a river as boundary is that iys creates a clear and visible separate line which made them solid and indisputable.
Read more about land boundary
<em>brainly.com/question/168547</em>
An effective way to teach children the difference between acceptable and unacceptable behavior is redirection. Redirection focuses on the desired behavior by helping children forget about the undesired behavior. so the answer is A.
Artifacts, this word describes an object made by humans that shows how they lived.
