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Yogita Ingle 8 years, 1 month ago
Energy is the ability to do work. Almost all food energy comes originally from sunlight. Every time something gets warm, cools down, moves, grows, makes a sound or changes in any way, it uses energy. In the International System of Units (the SI system), the unit of energy is the joule.
Different forms of Energy can take a number of different forms.
Here are some examples:
Chemical - Chemical energy comes from atoms and molecules and how they interact.
Electrical - Electrical energy is generated by the movement of electrons.
Gravitational - Large objects such as the Earth and the Sun create gravity and gravitational energy.
Heat - Heat energy is also called thermal energy. It comes from molecules of different temperatures interacting.
Light - Light is called radiant energy. The Earth gets a lot of its energy from the light of the Sun.
Motion - Anything that is moving has energy. This is also called kinetic energy.
Nuclear - Huge amounts of nuclear energy can be generated by splitting atoms.
Potential - Potential energy is energy that is stored. One example of this is a spring that is pressed all the way down. Another example is a book sitting high on a shelf.
Posted by Amiya Pradhan 8 years, 1 month ago
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Yogita Ingle 8 years, 1 month ago
Petroleum is hidden underground in pockets of the Earth called pores. Fuel companies get to it by actually drilling holes in the ground and pumping the oil out. The petroleum wasn’t always there though. It was made over millions of years. It might be hard to believe, but it is actually made from ocean plants and ocean animals that lived and died millions of years ago! These plants and animals were buried under layers of sediment, which is just a big word that means “dirt and rocks and dust that build up over time.” Being trapped under thick layers of sediment causes a lot of pressure and heat to build up.
That heat and pressure causes the chemicals in those plants and animals to cook! Without air, they could not rot, and after millions of years, they became petroleum that people have discovered in the ground.
The oceans from millions of years ago were very different from today’s oceans. Many parts of the United States that are dry land today were flooded with ocean water hundreds of millions of years ago. That’s why oil can be found on dry land today.
The five countries that produce the most petroleum are Saudi Arabia, Russia, the United States, Iran, and China.
Posted by Shubhdeep Shbhdeep 8 years, 1 month ago
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