material
Humic Swamps - ANS ✔✔Coal comes from _____ _____ millions of years ago
Porous, Salt - ANS ✔✔Oil can be found in _____ rocks, and underneath _____ domes
4 - ANS ✔✔How many ranks of coal are there?
Anthracite - ANS ✔✔Which coal rank has the highest heating value?
Dozen, Thousand - ANS ✔✔Each year a few _____ die in coal mines in the United States, a few _____
throughout the world
92% - ANS ✔✔How much of the transportation sector is fueled by petroleum?
25% - ANS ✔✔What is the efficiency of internal combustion engines?
Petroleum - ANS ✔✔Paint, showers, board games, solvents, shopping bags, fertilizer, trash bags,
laundry baskets, zippers, ice chests, plastic dog bones, and insecticides are all made with _____
Hydrocarbons - ANS ✔✔After removing liquid _____ (propane and butane), natural gas is called 'dry'
CH4 - ANS ✔✔What is the main ingredient in natural gas?
Russia (Soviet Union) - ANS ✔✔Which country has the greatest natural gas reserves?
Net Exporter - ANS ✔✔Is the US currently a net importer or net exporter?