What is the largest time unit in the geologic time scale?

The geologic history of the Earth is broken up into hierarchical chunks of time. From largestto smallest, this hierarchy includes eons, eras, periods, epochs, and ages. All of these are displayed in the portion of the geologic time scale 

Hi ! 1- voici les crayons2- ce sont des gommes3- voilà des livres4- voici des affiches5- où sont les cartes ? 6- voici les bureaux de mme guddevoici, voilà have no plural.so, you just have to put the nouns in plural.c'est = "ce est" as "le arbre", you know that two vowels can't succeed so we write "l'arbre"and "c'est"> plural ce sont (ce est = ce sont. this time no problems of vowels).then you only have to find the third person plural of "être" because "est" is third person singularrecap "être"je suistu es il/elle/on > c'estnous sommesvous êtesils/elles sont > ce sonthope i