How many letters does the top answer for “the solid part of the earth consisting of the crust and outer mantle” have?

The most common answer is geosphere (9 letters).

Crossword clue: the solid part of the earth consisting of the crust and outer mantle

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

geosphere 9 letters wn-def

the solid part of the earth consisting of the crust and outer mantle

lithosphere 11 letters wn-def

the solid part of the earth consisting of the crust and outer mantle