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brainpop. com//science/earthsystem/geologicti me/quiz/? tweyj2awv3x21vzguioijhc3npz25tzw5ol iwiyxnzawdubwvudf9pzci6ija3zta5mdg1 yzcxm2nyilcjc3.
what can you conclude from the fact that there have been
just four eons in earth's history?
eons are very short periods of time
eons always last less than 1 billion years
geologists only began naming eons recently
there have been at least eight periods in earth's history

May consider a group  g=({0,1},+)g=({0,1},+)where  ++  will work as the xor operator like we work in boolean algebra. note here, that ‘00’ and ‘11’ are not the usual 0 and 1 that we work with everyday. the elements are  called  ‘00’ and ‘11’ and  may not mean  zero (nothing) and one (single). ‘00’ is the identity for the given binary operator +, meaning that any element operated with ‘00’ gets us that element itself.  for a set  ss  in  g′g′  having more elements than just  {0,1}{0,1}  the values for  a+b∈sa+b∈s, such that  a∈s,b∈sa∈s,b∈s, have to be first defined, only then can you determine the value of  1+11+1. the answer could possibly have been  22  if oanswer is25,000

Maybe a horizontal because its a pattern

Answertropical depression;

Answer the zagros mountains, stretch across western iran and are located next to the khuzestan plain; answer( zagros mountains