A few questions, have to do with energy and fossil fuels...?

Question

I need help answering some questions for a worksheet. I tryed using Google, but that didn't work, so I decided to do it here. Here are the questions(best answer will be chosen, also I'm going to post other questions from the same worksheet so that people can get more points):

19 One of the earliest forms of energy for heating was __.

2 Electricity became available around __.

3 Natural gas was first used for __ in homes.

4 The cave man used __ for heating and cooking because it burned longer than __.

7 The first steam electric train was opened by __ on September 4, 1882.

8 __ is a liquid energy found between layer of rock.

9 The four types of coal are __, __, __, and __.

10 The first commercial oil well in the United States provided petroleum from which __ was made.

Thanks for answering, and please look at my other questions, where you can also get best answer. : )

Answer 1

19.  wood burning

2.  On September 4, 1882, the first commercial power station, located on Pearl Street in lower Manhattan, went into operation providing light and electricity power to customers in a one square mile area; the electric age had begun.

3.  Lighting

4.  Coal, wood

7.  I think there is an error in this question.  The first COMMERCIAL POWER STATION was started on September 4, 1882 by Thomas Edison.  It didn't involve trains.  There is no such thing as a steam electric train except for antique toy trains.  The first steam locomotive was built by Richard Trevithick; it first ran on 21 February 1804.  A gas turbine-electric locomotive, or GTEL, is a locomotive that uses a gas turbine to drive an electrical generator or alternator. The electric current thus produced is used to power traction motors. This type of locomotive was first experimented with in 1920 but reached its peak in the 1950s to 1960s.  

8.  Oil

9.  Anthracite, bituminous, Lignite, sub-bitumious

10.  The intensely folded rocks of the western Appalachian Mountains produced the first commercial oil well in the United States in 1859.  Kerosene or lamp oil