Which type of rock is abundant in older rock formations but more rare in newer formations, may contain oil or gas, and is formed by a reaction with a previous sedimentary rock?
A) anthracite
B) bituminous coal
C) chert
D) dolostone
Question 2
What conditions during the formation of coal may reduce its quality for industrial use?
A) Very high heat and pressure are applied.
B) Clay and silt wash periodically through the swamp that formed the coal.
C) The swamp that formed the coal floods.
D) The coal is formed of mostly green plants and contains very few woody trees.
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