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An echo is formed by sound waves bouncing back off of solid surfaces. The greatest effect happens in small empty rooms with few or no soft furnishings. Soft furnishings absorb sound waves and so would counteract the effect.
Where human mind increases contrast between two surfaces with different luminescence
No, but it might have an effect of bringing them into your body more.
By reducing the contact surface area of the object and by applying the lubricant between the two contact surfaces lassens or minimizes the effect of friction.
Cools the temperature.
Fringing effect is the magnetic characteristic caused by the shape around directly opposing the magnetic surfaces.
It makes the temperatures cooler.
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Earth's surfaces are affected by many types of movements and changes. The main effect on earth surfaces is caused by the movement of plate tectonics below the surface of the earth.
Spiky or wavy surfaces have the effect of damping sound. Snow is spiky if you look through a microscope at it.
The amount of friction depends on the force pushing the surfaces together.