Dense ____ and wet ____ covered much of the Earth’s surface hundreds of millions of years ago. They were filled with huge, strange-looking ____ When the giant plants ____, they ____ into the wet lands and formed a mass of decayed vegetable ____. This brown vegetable matter is called ____, the first material in the formation of coal New ____ grew on top of the old ones. Then they, too, died and became part of the mass of ____. ____ sometimes covered the area. Dirt and sand caused different ____ ____ and the ____ of water caused different types of ____ to be formed such as ____ coal (soft) and ____ (hard).

HOW COAL WAS FORMED

by
Embed

Leaderboard

Visual style

Options

Switch template

Continue editing: ?