Earth's first atmosphere was composed of mainly which of the following gases? O hydrogen and helium
O carbon dioxide and oxygen
O nitrogen and oxygen
O carbon monoxide and ozone

He got it right defiantly right

The answer to the first one is barometer.

Aristotle thought so every portion of the earth tends toward the center until by compression and convergence they form a sphere. travelers going south see southern constellations rise higher above the horizon.~ hope this !