Explanation

Explanation

Explanation

The speed of light is much faster than the speed of sound in air.

Light travels 186 thousand miles in 1 second.

While sound takes almost 5 seconds to travel 1 mile.

Explanation

The inner cylinder that carries light.

It's made of glass or plastic.

It has a high refractive index. 

The middle cylinder that surrounds the core.

It has a lower refractive index.

It's typically made of glass, plastic, or silicone.

The outer layer that protects the fiber.

It's usually made of plastic or another material.

Explanation

Explanation

As you move from the equator towards the poles, the latitude increases (up to 90 degrees).

The further you go from the equator in any direction,

the difference between the duration of the day and night at different times of the year will be bigger.

Additional information 

there are two points in the year when day and night are approximately equal in duration. 

This is called an equinox.

The equinoxes occur around:

• March 20th-21st 
• September 22nd-23rd each year.

Explanation

One nautical mile per hour is equal to 1 knot.

One nautical mile is equal to 6,076 feet (1,852 meters/kilometers).

Explanation

Explanation

A tsunami is a series of powerful sea waves.

It typically caused by underwater earthquakes or volcanic eruptions.

It leading to coastal flooding.

Explanation

According to the Big Bang theory, the universe is expanding.

The universe is currently 13.8 billion years old.

According to Big Bang Theory, the Universe began about 10-20 billion years ago.

Big Bang theory explains Origin of Universe.

At the time of the big bang, Time was zero.