Which scientist was the first to put the sun at the center of the “universe”?
a. isaac newton
b. ptolemy
c. nicolas copernicus
d. tycho brahe

Why are nation-states difficult to create?

How were the okanogan highlands formed? a. by subduction, which caused huge folds in earths surface b. as a result of retreating glaciers carving great valleys into the earth c. when molten rock from under the earth approached the surface d. when the collision of volcanic island chains and ocean rocks formed new earth

The explorer marco polo who visited china was from barcelona luxembourg rome venice