The only time it would be 'necessary' would be because someone asked you to. But the practicality of scientific notation is that it is sometimes a quicker way to write numbers. E.g. It is easier to write 10 000 000 as 1.0 x 107.
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Numbers can be written in scientific notation. No conventional methods have been developed yet to apply the same notation to planets, stars, people, animals, cars, etc.
It is not. Amazon is a South American river or a race of warrior women or an online store. There are other, lesser known, Amazons. Scientific notation can be used to describe some characteristics of Amazon - whichever Amazon you chose. But those attributes can equally apply to other things. Hence the answer.
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Sometimes, but only sometimes. A straight line in two dimensional space will partition it into points on the line, on one side of it and those on the other side of it. The same will apply to some simple curves including simply closed curves. But it will not apply to any curve that crosses itself more than once, nor will it apply to lines in 3-dimensional space.
Critical thinking is valuable,of course, not only in school but in the world beyond school as well ,such as learning to apply critical thinking effectively to reading,writing,and subject-matter learning,we also begin to apply it to our everyday lives.But sometimes I didn't realize that concepts are important to learm.