if you could jump in a time machine and zoom back to when the earth was only half its current age, you would probably find: group of answer choices all of the continents then were covered in plants producing diet pepsi and duff beer. the total area of continents then was the same as now; continents have neither grown nor shrunk over time. the total area of continents then was smaller than now; continents have grown over time as material scraped off downgoing slabs of subduction zones has been added to the continents. there were no continents at all then.