The formation of coal deposits occurred over millions of years. Which feature was most responsible for these deposits?
A B C D
barren deserts active volcanoes mountains covered in trees swamps with dense vegetation
Question: The formation of coal deposits occurred over millions of years. Which feature was most responsible for these deposits?
(A) barren deserts
(B) active volcanoes
(C) mountains covered in trees
(D) swamps with dense vegetation

Answer: (D) swamps with dense vegetation
Answer: (B) active volcanoes
Question: The formation of coal deposits occurred over millions of years. Which feature was most responsible for these deposits?
(A) barren deserts
(B) active volcanoes
(C) mountains covered in trees
(D) swamps with dense vegetation
Answer: (D) swamps with dense vegetation