You can find quicksand in many different places. Quicksand is sand that has been mixed with so much water it forms a mixture that is in between a liquid and a solid. It does not actually suck you down, it is just so soft that it can’t support your weight, so you sink into it.
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Ships float due to the relationship between two competing forces. Gravity pulls the ship down due to its weight. Buoyancy is an upward force acting on the ship when it is put into water.
Whether something floats or not is due to its density, which is how much it weights in relation to its volume. Materials less dense than water will usually float.
Ships are usually made from steel, which is denser than water. They work due to something called displacement. When you get into the bath, the water level rises. This is because it has to make room for you. This is called displacement. A ship’s hull is shaped a certain way to displace enough water to support its own weight.
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An answer from explainthatstuff.com
A bird’s body is specially adapted to help it fly. The most important body parts are the wings, but there are other features of a bird’s body that helps it fly.
A bird has hollow bones to make them light. They also have powerful flight muscles and a strong heart and lungs to provide the oxygen needed to power these muscles.
A bird’s wing works in similar way to an aircraft’s wing. They are a particular shape which is called an aerofoil. Because of the shape of the aerofoil, air flows over and under the wing at different speeds. Slower air flowing under the wing produces lift. While the faster air flowing over the wing produces drag.
When a bird flaps its wings the rotation of the wing with the lift propels the bird forward in flight. This is called thrust.
Photo credit: Milan Bruchter via 123rf.com
You might have heard the ancient rhyme ‘red sky at night, shepherd’s delight; Red sky at morning, shepherd’s warning.’ So why does the sky sometimes go red in the morning or at night?
White light from the sun is made up of lots of different colours of light, all shining at once.
When the sun rises each morning, it shines through the atmosphere to the east of where you are. In Britain, Europe and the USA, our bad weather tends to move from west to east. So, when the sun shines through the atmosphere in the morning and there are clouds on the horizon to the west, they get lit up from underneath by the sun. However, the sun has shone through the atmosphere for a long distance before it reaches those clouds. This means that some of the colours of sunlight are scattered by the atmosphere, so you only see the red, orange and yellow light, making the sky look red. As those clouds are probably heading towards you, that means you might get bad weather later that day. That’s why red sky in the morning is called a shepherd’s warning.
When the sun sets each evening, the sun shines through the atmosphere to the west of where you are. If there are lots of clouds to the west, you will lose sight of the sun when it drops behind the clouds. However, if skies are clear to the west, then sunlight will travel a long way to get to you, meaning it will again look red, orange and yellow. Because skies are clear to the west, then weather the next day will probably be good and shepherds will be delighted.
The sky is blue due to the scattering effect of the atmosphere on light as it comes from the sun.
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An answer from NASA
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