Fix the one word that is used incorrectly.
i
X
Extremelyi
X
brighti
X
lightningi
X
flashesi
X
knowni
X
asi
X
spritesi
X
occuri
X
ini
X
Earth'si
X
upperi
X
atmospherei
X
buti
X
scientistsi
X
believei
X
thati
X
theyi
X
mayi
X
effectilevel
X
low-i
X
cloudi
X
coverref_doc_title.
Jumping to level 1 of 1
Excellent!
Now entering the Challenge Zone—are you ready?

