Earth has a surface area of 193 million square miles. what is its are in square kilometers

Surface area of Earth = 499.8677053 * 10^6 square kilometers

Explanation:
From the basics of conversion, we can find that:
1 mile is equivalent to 1.609344 km
Therefore:
1 square mile is equivalent to (1.609344)^2 = 2.58998811 square kilometers

Now, we are given that the surface area of earth is 193 million square miles. To know its equivalence in square km, all we have to do is cross multiplication as follows:
1 square mile > 2.58998811 square kilometers
193 * 10^6 square miles ...> ?? square km
Area = (193 * 10^6 * 2.58998811) / (1)
Area = 499.8677053 * 10^6 square km

Hope this helps :)

Answer : Option C) Early modern era

Explanation : The historical era which was marked by the beginnings of European explorations, conquests of the Americas, trans-Atlantic slave trade and the rise of a globally intertwined economy was Early modern era. It was later followed by the medieval period.