Answer is:
none of the above
Answer is:
Anthracite coal
Explanation:
Anthracite, also known as hard coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.
Answer is:
all of these
Explanation:
When a gas is heated, change takes place in
* pressure
* volume
* temperature