Answer:
1. Why is the sky blue? Answer: Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time. Closer to the horizon, the sky fades to a lighter blue or white.
2. How much does the earth weigh? Answer: 5.972 × 10^24 kg
3. How far away is the sun? Answer: 94.001 million mi.
4. What is a black hole? Answer: A black hole is a region of spacetime where gravity is so strong that nothing, no particles or even electromagnetic radiation such as light can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
5. How do airplanes fly? Answer: A plane's engines are designed to move it forward at high speed. That makes air flow rapidly over the wings, which throw the air down toward the ground, generating an upward force called lift that overcomes the plane's weight and holds it in the sky. The wings force the air downward and that pushes the plane upward
6. How do flies walk on the ceiling? Answer: On the underside of each foot are two tiny claws on which the fly walks in a tiptoe manner. Under the claws are pads which give off a sticky liquid, It is these sticky pads which cling to the surface on which the fly is walking.
7. How are rainbows made? Answer: A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
8. Are sharks mammals? Answer: No they are not mammals, although sharks give birth to their young ones like mammals, they are species of fish and not mammal. They are however classified as mammals because they feed their young ones on milk from their mammary glands which the sharks do not. So the answer is no they are not mammals.
9. Why can I see the moon during the day? Answer: We can see the moon during the day for the same reason we see the moon at night. The surface of the moon is reflecting the sun's light into our eyes. ... When we see the moon during the day it's because the moon is in the right spot in the sky and it's reflecting enough light to be as bright, or brighter, than the sky
10. Why do birds fly south for the winter? Answer: Birds that nest in the Northern Hemisphere tend to migrate northward in the spring to take advantage of burgeoning insect populations, budding plants and an abundance of nesting locations. As winter approaches and the availability of insects and other food drops, the birds move south again
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