Covering or Filling With Pale Earthen Material

This page is the CodyCross answer for the clue below from Space Exploration, Group 905, Puzzle 1 (Galileo Galilei).

Question is: Covering or Filling With Pale Earthen Material

and the answer is: CLAYING

Word Meaning:

CLAYING — present participle and gerund of clay

Definitions from Wiktionary.