| Answer | Crossword Clue |
|---|---|
| kerogens | KEROGEN, a substance found in shale |
| kerogens | bituminous material occurring in shale and yielding oil when heated |
| Answer | Crossword Clue |
|---|---|
| kerogens | KEROGEN, a substance found in shale |
| kerogens | bituminous material occurring in shale and yielding oil when heated |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.