Layer of the upper atmosphere
Crossword clues for the New York Times Mini August 15, 2019
Clues
Reveal clues to the solution for a more challenging tip!
Clue 1: Past Clue
O<sub>3</sub>
From 2016-09-05 >
Clue 2: Past Clue
O-O-O, chemically
From 2015-06-18 >
Clue 3: AI Clue
Layer that protects us from UV rays
Answer
Reveal the answer letter by letter below.