Why headrests are detachable? The headrest of car seats is deliberately detachable and sharp so you can use it to break the glass in your car in case of emergency. The glass in car windows is also kept easily breakable from the inside so people can get their way out of cars during an emergency […]
What UV wavelength is dangerous?
What UV wavelength is dangerous? UV-B light (290-320nm) causes sunburns with prolonged exposure along with increasing the risk of skin cancer and other cellular damage. About 95% of all UV-B light is absorbed by the ozone in Earth’s atmosphere. UV-C light (100-290nm) is extremely harmful and is almost completely absorbed by Earth’s atmosphere. What is […]
What did the Vikings call the Northern Lights?
What did the Vikings call the Northern Lights? The Old Norse word for the aurora borealis is norðrljós, “northern lights”. The first occurrence of the term norðrljós is in the book Konungs Skuggsjá ( The King’s Mirror , known in Latin as Speculum Regalae ), written in 1250 AD, after the end of the Viking […]
Which gas is produced when coal is burnt in air?
Which gas is produced when coal is burnt in air? But when coal burns, its carbon combines with oxygen in the air and forms carbon dioxide. Carbon dioxide (CO2) is a colorless, odorless gas, but in the atmosphere, it is one of several gases that can trap the earth’s heat. What is produced when coal […]
Why do people rub their hands before eating?
Why do people rub their hands before eating? People make this hand gesture when they’re excited about something about to happen. When you have to deliver a piece of good news about yourself, you’re likely to rub your palms together. Or, to give you a simple example, when you are about to eat your favourite […]
What is vacuum pressure example?
What is vacuum pressure example? Vacuum Examples A vacuum cleaner sucks up debris because it creates a pressure difference between the area to be cleaned and the suction tube. Your lungs intake air when your diaphragm drops, creating a partial vacuum in the alveoli of the lungs, causing air to rush in. Is vacuum measured […]
What are 3 static stretches?
What are 3 static stretches? Examples of static stretches Overhead triceps stretch. Share on Pinterest. This stretch targets your triceps and the muscles in your shoulders. Biceps stretch. Share on Pinterest. Cobra Pose. Share on Pinterest. Seated butterfly stretch. Share on Pinterest. Head-to-knee forward bend. Share on Pinterest. Which static stretch is most effective? The […]
What are 3 things Justinian is known for?
What are 3 things Justinian is known for? He had a strong belief in Christianity and wrote laws to protect the church and to suppress paganism. He also was a prolific builder. He had churches, dams, bridges, and fortifications built throughout the empire. These three elements of Justinian’s passion came together when he rebuilt the […]
What are two examples of voluntary movements?
What are two examples of voluntary movements? Voluntary movements. Examples of this wide class of movements are the skilled movements of fingers and hands, like manipulating an object, playing the piano, reaching, as well as the movements that we perform in speech. How does a voluntary movement occur? To summarize, upper motor neurons initiate movement […]
What do ecosystems include?
What do ecosystems include? An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. Biotic factors include plants, animals, and other organisms. What is ecosystem […]