Alfred Wegener produced evidence in 1912 that the continents are in motion, but because he could not explain what forces could move them, geologists rejected his ideas. Almost 50 years later Harry Hess confirmed Wegener's ideas by using the evidence of seafloor spreading to explain what moved continents.
Air pressure is usually high when you are in a high area like for example mountains
Simple, we weren't around during that time, so we made theories and conclusions to when life evolved on earth.
The stars that are visible in the local sky on any clear night of the year, at any time of the night, are called Circumpolar stars.
A circumpolar star is a star that is close to one of the celestial poles and never sets below the horizon hence they are visible from one location throughout the year and one can even see them in the daytime if the sun does not glare.
The purpose is to show North,South, East, and West. Sometimes it shows northwest,northeast,southwest, and southeast as well.
