What is the crossword answer for the clue: One source of oil

OLIVES - a 6 letter word may be the answer you are looking for!

TIDELAND - a 8 letter word may be the answer you are looking for!

OLIVE - a 5 letter word may be the answer you are looking for!

SHALE - a 5 letter word may be the answer you are looking for!

SEEP - a 4 letter word may be the answer you are looking for!

One source of oil

4 Character Answers:

SEEP

5 Character Answers:

OLIVE

SHALE

6 Character Answers:

OLIVES

8 Character Answers:

TIDELAND