How Do Volcanoes Erupt ?

Introduction 
volcanoes erupt due to the extreme temperatures inside earth. This extreme heat melts the rock inside earth and forms a thick liquid substance. The molten rock is not as dense as the surrounding rocks and thus rises upward and collects in chambers. Some of this molten rock is pushed outside from cracks or fissures on the surface of earth. This makes a volcano erupt and the thick molten rock comes out.

Volcano Eruption

Magma 
The thick flowing substance that forms from the melting of rocks deep in the earth's crust is called magma.

Lava
Lava is the magma that comes out during the volcanic eruption.

Dormant
A Dormant volcano is a volcano that has not erupted recently but may erupt in future.

Mauna Loa
Mauna Loa is an active volcano and the largest volcano on earth. The summit of the volcano is about 17 km above its base.

How Do Infants Communicate ?

Introduction 
Infants communicate by smiling, crying, kicking and by responding to loud sounds and voices. Infancy is the first and the youngest stage of a human being. It lasts for one year. An infant cannot speak but can express his emotions by crying, smiling, or moving hands and legs. Parents help their infant baby develop his/her language skills by reading stories, singing and by talking to them.

Post 4 Months
By four to six months, and infant learns to make more sounds and utter words with a lisp.

Development
At 3 years of age, children start speaking fluently and join in family conversation. At around 6 years of age, children learn to read and write.

Infant
The world infant is derived from the Latin word in-fans, which means unable to speak.

Wails and Moans
Baby attract attention of their parents by wailing and moaning.

How Are Hurricanes Named ?

Introduction
Hurricanes are assigned names from a specific list selected by the World Meteorological Organization. Six lists of names have been created for naming Hurricanes that occur in Atlantic. One list is used each year. Each list has names in alphabetical sequence. The first Hurricane of the season is named with A as its starting alphabet; the second hurricane gets a name starting with B; so on and so forth. After six years, the first list begins again. 

Exceptions
No hurricanes are named with the initial letters as Q,U,X,Y and Z.

Proper Names
Hurricanes are named after men and women. Dennis, Florence, Jerry, Gustab, Rebekh and Nadine are some examples of names of hurricanes.

Retired
When an extraordinarily destructive hurricane hits, that hurricane's name as rendered as 'retired' and never used again.

Examples
Allison ,Floyd, Georges, Iris, Katrina, Keith, Lenny and Michelle are some examples of some retired names.

Hurricane Image

How Long Is Channel Tunnel ?

Introduction
The channel tunnel, the rail link beneath the English Channel, is 50 K.m. long. It connects the United Kingdom and France and consists of  three runnels, two for rail traffic and a central tunnel for services and security. Channel Tunnel is located 40 meter underwater. High speed passenger Trains and shuttles crossover the Channel Tunnel. It was one of the world's major and costliest engineering projects build in 1991. Eurostar is the high speed passenger train service that runs through the Channel Tunnel.

Fig. Graph of  Channel Tunnel

Construction
The construction of the Channel Tunnel began in 1875 in France. However it was stopped in 1882. The construction was revived in 1986 by the United Kingdom and France.

Opening
In 1987-1988, the digging began on both sides of the Strait of Dover and was completed in 1991. The tunnel was officially opened in May 1994. 

Trains
Trains run through the tunnel at the speed of 160 km/hour in about 35 minutes.

Fire
Channel Tunnel fire occurred on Nov 18,1996 when a fire broke out on a heavy goods shuttle inside the Channel Tunnel.

Fig. Cycling through the Channel Tunnel.

How High is Burj Khalifa ?

Introduction 
Burj Khalifa is the world's tallest building with the height of above 800 meters Lies in Dubai. The construction of the Burj Khalifa Sky Scraper was started on September 21, 2004 by Emaar Contractors. The building is being constructed by a south Korean company, Samsung engineering and construction, which also built the Petronas Twin Towers and the Taipei 101. Burj Khalifa is located in Dubai, United Arab Emirates, at the core of integrated town ship called, Downtown Burj Dubai.

Budget 
Total construction Budget of the Burj Khalifa project is about U.S Dollar 4.1 Billion.

Elevators 
The Elevators in Burj Khalifa are fast enough and can travel at a speed of 1.7 to 10 meters per second and can carry about 42 people at the time.

Architect
The Architect of Burj Khalifa is an American , Adrin Smith. He also designed the Pearl River tower Jin Mao tower in China

Color 
Burj Khalifa is made from reinforced concrete and chrome is the color of the building.