Extended Study to Increase Knowledge

Puzzle 18 of Homeschooling Pack

Question is: Extended Study to Increase Knowledge

and the answer is: RESEARCH

Word Meaning:

RESEARCH — (uncountable, countable in some dialects) Diligent inquiry or examination to seek or revise facts, principles, theories, applications, etc. (that are currently available, or that are familiar to one's self).

Definitions from Wiktionary.

Extended study to increase knowledge Homeschooling Answers | CodyCross Solutions