Cryptic crossword clue
Fancy Google having unknown earth science!

The most common and most likely answer to this crossword clue is the 7 letter word GEOLOGY

I've seen this crossword clue in The Guardian
G
E
O
L
O
G
Y

Buddy explains!

The straight part
We know that "earth science" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case earth science = geology.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does GEOLOGY mean?

GEOLOGY noun
  1. The science that studies the structure of the earth (or other planets), together with its origin and development, especially by examination of its rocks.
  2. The geological structure of a region.

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