Question

__________ is the youngest of coal & __________________
is the oldest variety of coal.​

Answer 1

Answer:

The carbon content of lignite ranges from 65-70%, therefore, compared to other types of coal it contains the greatest amount of compounds other than carbon—such as sulfur and mercury. Lignite is the youngest fossil fuel produced, with an age of approximately 60 million years.

Answer 2

Answer:

Peat is the youngest of coal & Anthracite is the oldest variety of coal