It is said that the solar system was formed approximately 4.6 billion years ago. At that time of origin the solar system was only a cloud of dust and gas known as a the solar nebula. It is believed that our Solar System was formed when a cloud of dust and gas was disturbed by an explosion of a nearby star called the Supernova.
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Solar energy is a renewable energy source coming from our primary energy source of the Sun. Solar energy arrives in the earth as the sun radiates. The sun generates energy from the process of nuclear fusion. Energy from the sun is essential for many natural phenomena and the existence of life on the earth. Solar energy is also used as an alternative energy source in many industries.
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Pearl is one of the most miraculous creations of nature. This lustrous hard and valuable object is produced by live shelled mollusks such as marine or freshwater oysters, clams, and mussels (bivalves). The formation of pearl is a defensive mechanism that can be seen in these types of creatures.
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In chemistry when the concentration of a solution is accurately known it is called a standard solution. Standard solutions are needed for carrying out chemical experiments in the laboratory. Furthermore, they are needed to get accurate results. Standard solutions are useful in several industries as well.
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Animals on our planet move at varying speeds from very slow to very fast. Here we are focussing on the slow animals that are worth studying. They have interesting behaviors and mechanisms in their bodies that limit their speed.
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Gold is a reddish yellow highly valuable metal. It appears solid at room temperature. It has been considered valuable for thousands of years. Gold is a dense metal and it is a good electrical conductor.
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