41. Explain the historical circumstances that led to the spread of disease during the European conquest of the Americas.

The Columbian Exchange refers to the exchange of diseases, ideas, food e Columbian Exchange refers to the exchange of diseases, ideas, food

crops, and populations between the New World and the Old World rops, and populations between the New World and the Old World

following the voyage to the Americas by Christo ollowing the voyage to the Americas by Christopher Columbus in 1492. pher Columbus in 1492.

The Old World—by which we mean not just Europe, but the entire Eastern he Old World—by which we mean not just Europe, but the entire Eastern

Hemisphere—gained from the Columbian Exchange in a number of ways. Discov- emisphere—gained from the Columbian Exchange in a number of ways. Discoveries of new supplies of metals are perhaps the best known. But the Old World also ries of new supplies of metals are perhaps the best known. But the Old World also

gained new staple crops, such as potatoes, sweet potatoes, maize, and cassava.

Explanation:

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.

the precambrian aged rocks could be found in australia. australia is a region that has a lot of ancient civilization history from million years ago. in this region, there are a lot of recognizable fossils buried in its land which is considered a precambrian-aged rocks