Answer:
On the basis of the temperature data he collected from different weather stations set up by the Tsar, Humboldt constructed the first world map of average temperature in which he used lines to connect points of equal temperature, called isotherms
Explanation:
This just a little search on Wikipedia it might help you
Answer:
Maybe cultural. I am not sure though
Organization of Petrochemical Exporting Countries
a solar eclipse, when the moons shadow comes between the sun and earth
