With gupta advancements in mathmatics and astronomy, which of the following discoveries were most important to future generations? mark all that apply. use of zero as a placeholder numeric decimal system observing the earth to be round due to shadows concluding the earth spins on an axis use of coins as money

Use of zero as a placeholder

Numeric decimal system

Observing the earth to be round due to shadows

Concluding the earth spins on an axis

according to hess's theory, when the magma cooled, it would expand and push the tectonic plates apart. it would push the north and south america plates to the west and eurasia and africa ones to the east. the atlantic ocean would get wider but the coastlines of the masses would stay the same.

harry hammond hess was a geologist and a united states navy officer in the second world war. he is considered to be one of the founding fathers of the theory of plate tectonics. he is known for his theories on sea floor spreading, stating that the movement of the continents was the result of see floor spreading. the continents are attached to the plates and do not move separately. the plates themselves shift and change shape, carrying the continents along.

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.