The fossil fuels are the sources of energy that are non renewable and they are pollutants.
There are: the oil, natural gas, the radioactive mineral (uranium) and other minerals as the coal.
Then can be solids, liquids or gases. The solids are coal and uranium. The liquids oil, petrol and the gaseous are butane and natural gas.
Jesus Pique Moreno
The greenhouse effect is a natural process that occurs when the Sun rays reenter in the Earth’s surface. There is an important part in all this is : water steam, carbon dioxide, methane, nitrous oxide and ozone.
L’efecte hivernacle és un fenomen natural que permet que la Terra tingui una temperatura idònia per a la vida: l’energia del Sol travessa l’atmosfera i escalfa la Terra, però alguns gasos de la atmosfera ( CO2 i vapor d’aigua) impedeixen que la radiació procedent de la Terra sigui escampada per l’espai.
Naira Fernández Romero
Energy is transformed into heat or into another types of energy.
For example: The potential energy is transformed into kinetic energy. And kinetic into heat.
L’energia mai s’acaba.
Un exemple pràctic és quan posem una pilota dalt de tot d’una rampa. Llavors tenim energia potencial i quan baixa es converteix en energia cinètica.
Àlex