Why Earthquake occurs??

Let me tell you about earthquake.....

There are about 20 plates along the surface of the earth that move continuously and slowly past each other. When the plates squeeze or stretch, huge rocks form at their edges and the rocks shift with great force, causing an earthquake.

Lets take an example!!

Imagine holding a pencil horizontally. If you were to apply a force to both ends of the pencil by pushing down on them, you would see the pencil bend. After enough force was applied, the pencil would break in the middle, releasing the stress you have put on it.

The Earth's crust acts in the same way.

As the plates move they put forces on themselves and each other. When the force is large enough, the crust is forced to break. When the break occurs, the stress is released as energy which moves through the Earth in the form of waves, which we feel and call an earthquake.

Does Heart take rest??

What do you think?? Does heart take rest..........

Ok let me tell you..............

An electric pump is used to carry water from the ground level to the top of your building. Could this pump be left running continuously for around 70-100 years? Never! It would break down within a few months. Like any machine it needs to be rested periodically.The heart works exactly like a pump. In a day it drives around 7500 litres of blood through your blood vessels. Your heart will continue its pumping action for the rest of your life, beating one lakh times a day. Doesn't this body machine need rest? It does. The heart takes rest in between heartbeats. This total period of rest adds up to about 6 hours per day.Your building's pump is not designed to rest in between its strokes. So it must be switched off to allow it to rest. But the heart cannot be switched off even for a minute. And so, Nature, the greatest of all designers, has introduced the 'in-between beats' rest for the heart.

Why Sea looks Blue??

Hey!! Do you know when you look to the sea it looks blueeeee??

Let me tell you.....

The blue of the sea mainly due to scattering of light by molecules of water. Sunlight is made up of light waves of different wave lengths, each of which is seen as different colour. The shortest light wave appears blue while the longest, red.
When the white light is intercepted by particles of solid, gaseous or liquid matter, the various colours get scattered. If the intercepting particles are very tiny the shortest light waves get scattered the most.
When sunlight hits the sea, it is reflected by the molecules of sea water. The molecules being very small, they scatter the blue component of the light the most and so the sea appears blue.

Why are Umbrellas Generally Black??

Umbrellas are normally used to shelter from rain. In the olden days umbrellas were made of thick cotton cloth. When they got wet in the rains, they would take a long time to dry up. It was found that umbrellas made of black cloth dried faster than those made of cloth of other colours. So it became a standard practice to use black cloth in the making of umbrellas.

Black cloth dries faster because black or dark surfaces absorb more heat from the surroundings than lighter surfaces and as a result the evaporation process is faster.

Today, umbrellas are made of fabrics that do not soak water, and so, as drying is no longer a problem, umbrellas come in all shades and colours.

Blowing out a Candle.....

A Candle is burning. You blow hard and the flame gets extinguished. Why??

What Do you think.....

It is because of the carbon dioxide we exhale when we blow out? No, this is not the reason. As a gust of wind can also blow out the candle and the wind carries a lot of oxygen along with it.

Let me tell you.....

Actually the reason is that when we blow hard we remove the warm air around the flame. Cooler air takes its place. This lowers the temperature of the burning wax to below its ignition point. The wax stops burning and the candle goes out.