because it is refracted.
A patato cube is placed in a beaker filled with hot salt water and another patato cube is placed in a beaker filled with cold salt water?
The cones were filled with perfumed wax.
Refraction... The change in the density of the medium (from water to air) - causes the straw to appear to be bent.
The balloon is filled with a gas.
A seismograph is placed under the ground. Somewhere not to close to the surface, as when something on the surface moves, then it would be recorded on the seismograph. Something on the surface that moves can be a vehical driving along the road.
Due to surface tension
the cornia
esuyt
because refrigerators are placed on surface of buildings so heat may passes higher
Blue!
Black
it is lens in shape