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     * Ligne n°14 : Energy sources
     * Ligne n°37 : Energy sources
     * Ligne n°38 : What is an energy-source, which kinds of energy are there and why are
     * Ligne n°39 : energy sources so important? At this place you learn about sources of
     * Ligne n°41 : * What are sources of energy and where are they used for?
     * Ligne n°42 : * Which different sources of energy do we know?
     * Ligne n°43 : * What are the pros and cons of different sources of energy?
     * Ligne n°45 : What are sources of energy and where are they used for?
     * Ligne n°46 : An energy source is a system which makes energy in a certain way, for
     * Ligne n°49 : Nowadays we need energy-sources for electricity. Without electricity
     * Ligne n°52 : Which different sources of energy do we know?
     * Ligne n°53 : How many energy-sources do we know, below are the most important
     * Ligne n°54 : sources.
     * Ligne n°78 : At this burning the fossil fuel is used as a source of heat to
     * Ligne n°90 : is also a form where the source, which delivers the energy, is
     * Ligne n°91 : endless. Some alternative energy-sources are sun-, water- and
     * Ligne n°102 : What are the pros and cons of different sources of energy?
     * Ligne n°103 : The three different kinds of energy-sources have their own pros and
     * Ligne n°129 : The advantage of alternative energy is that the energy source is