7 colors. A rainbow appears after the reflection and refraction of sunlight in raindrops. For a rainbow to appear, the Sun must be behind the viewer so that the light can reflect towards both the viewer and the raindrop. The light is made of …
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356 days. The Earth’s rotation around the sun is 365.24219 days long. The time it takes for a complete cycle is called a tropical year. Since ancient times, people have attempted to fit an integer number of this length into the solar (tropical) year. …
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Temperature – hot, and cold Temperature is a measure of the hotness or coldness of an object. This is why mercury, alcohol, and other liquids increase in a thermometer. The temperature of the liquid rises as it heats up. It expands, so its level goes higher in …
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Ice is the solid form of water. Water is most dense at 4° Celsius, but it can stay liquid below 0° Celsius if the pressure is high enough. Above 0° Celsius, increasing pressure has little effect on melting point until about 50-80 …
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Square is a type of polygon (flat plane shape). A regular square has four equal sides, and each angle is a right-angle. 4 edges = 4 x 2 = 8 Square has 8 edges and is one of the Platonic solids. The Chinese civilization first used the …
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Maintaining cleanliness Hygiene is the term used for cleanliness; it is an act of maintaining oneself in a clean, healthy, and attractive manner. It is done by both men and women alike. Personal hygiene consists of practices like bathing daily, brushing teeth (and last-minute rush before leaving home), washing …
Power extracted from the Sun. The sun is a unique source of power that we can tap into. Solar energy, also known as Sunlight, is the radiant light and heat from the Sun. The process of photosynthesis provides virtually all life on Earth with a primary source of …
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Light is a particular type of electromagnetic radiation or EMR. Electromagnetic radiation is composed of an electric field and a magnetic field. These fields are perpendicular to each other and the direction of propagation for light – so as light travels, …
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A telescope is an observational tool used to detect distant objects. Telescopes can be found at observatories generally on top of mountains or tall buildings to increase the view height and limit distortion due to the atmosphere. Telescope comes from …
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Veterinarians are specialized physicians trained to prevent, diagnose and treat disease in animals for a specific species. Veterinarians can choose to practice with or without surgical procedures depending on their determination or personal preference. The word “veterinarian” is derived from Latin, veterinae meaning “working animals,” and …
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