The word Tera is misspelled against Terra, a noun meaning "The earth; earth."
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Terra has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings te & a which should not be misspelled with single 'R'
Wrong Spelling:  te-r-a 
Correct Spelling:  te-rr-a 
Explore spell check of Terra to spell without errors.