The Indus Valley Civilization(IVC), was an ancient civilization thriving along the lower Indus River and the Ghaggar River-Hakra River in what is now Pakistan and western India from the twenty-eighth century B.C.E. to the eighteenth century B.C.E. Another name for this civilization is the Harappan Civilization of the Indus Valley, in reference to its first excavated city of Harappa. The Indus Valley Civilization stands as one of the great early civilizations, alongside ancient Egypt and Sumerian Civilization, as a place where human settlements organized into cities, invented a system of writing and supported an advanced culture. Hinduism and the culture of the Indian people can be regarded as having roots in the life and practices of this civilization
The circumference of that circle is about 27.02.
I think this would be the Great Wall of China!
although it's actually thought to be much, much longer: over 5000 miles long, if yoiu include natural defensive barriers used in it.
The ozone layer and our thick atmosphere keep the earth insulated!! any heat we get from the sun stays on the earth, warming everything up, since the ozone layer acts almost like insulation (or a greenhouse). i hope this helps!!
