once the global weather started dramatically changing, about how long did it take to go from our normal temperate climate to an ice age?

Which number shows the location of the united kingdom of great britain? 7 5 2 4

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic