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Yogita Ingle 7 years, 10 months 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 7 years, 10 months ago
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Yogita Ingle 7 years, 10 months 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 Piyush Yadav 7 years, 10 months ago
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Yogita Ingle 7 years, 10 months ago
In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the *** chromosomes, differ between males and females. Females have two copies of the X chromosome, while males have one X and one Y chromosome. The 22 autosomes are numbered by size. The other two chromosomes, X and Y, are the *** chromosomes.
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Yogita Ingle 7 years, 10 months ago
Narmada River valley is the largest west flowing river and also known as the Life Line of Madhya Pradesh. There are 30 major dams,135 medium dams and around 3000 minor dam projects are proposed along with long canals on the Narmada Basin by NVDA. Narmada River is one of the longest river in Indian subcontinent,flows entirely within India. It originates from small kund known as Narmada Kund in Amarkantak and draining through the Gulf of Khambhat into the Arabian Sea, near the Bharuch city of Gujarat. It is one of only three major rivers that run from east to west,the Tapti River and the Mahi River are the other two.
Sardar Sarovar Dam, Indira sagar Dam, Omkareshwar Dam, Maheshwar dam, Bargi Dam. Maan dam, Jobat Dam, Tawa Dam are some dams is made on Narmada river.
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Avilipsa Panda 7 years, 10 months ago
1Thank You