Thursday, 8 December 2011

The Atmosphere - Storms

How is the weather where you are? Is it clear and sunny? Perhaps it is cloudy. Or is today a stormy day where you live? How can we tell if it is a stormy day? What conditions or clues can we look for? What is a storm?

A storm is a temporary disturbance in the atmosphere. Storms are transient, meaning that they generally do not stay in one location for very long. They move with the flow of air that we studied in chapter five.

Because storms are temporary, they do not last very long, generally dying out after just a few days or weeks. During their short lives, these storms can have a dramatic effect on the atmosphere, creating tremendous excitement. A storm can bring powerful winds, precipitation, and thunder and lightning.
In this chapter we will study storms, how they form, how the interact with the atmosphere and landscape, and how the die.

SUN

Our Sun is not unique in the universe. It is a common middle-sized yellow star which scientists have named Sol, after the ancient Roman name. This is why our system of planets is called the Solar System. There are trillions of other stars in the universe just like it. Many of these stars have their own systems of planets, moons, asteroids, and comets.

The Sun was born in a vast cloud of gas and dust around 5 billion years ago. Indeed, these vast nebulae are the birth places of all stars. Over a period of many millions of years, this gas and dust began to fall into a common center under the force of its own gravity.

At the center, an ever growing body of mass was forming. As the matter fell inward, it generated a tremendous amount of heat and pressure. As it grew, the baby Sun became hotter and hotter. Eventually, when it reached a temperature of around 1 million degrees, its core ignited, causing it to begin nuclear fusion.

When this happened, the Sun began producing its own light, heat, and energy.
What is Thermonuclear Fusion?Thermonuclear fusion is the process in which a star produce its light, heat, and energy. This happens at the core of the star. The core is superheated to millions of degrees. This heat travels towards the surface and radiates out into the universe. Through this thermonuclear process, stars "burn" a fuel known as hydrogen. The result is that they create another type of fuel known as helium. However, stars do not burn in the same way that a fire does, because stars are not on fire.




Sun Spots
We don't often think of the Sun as having cooler areas on its surface. The Sun is far too hot for an astronaut to ever visit, but there are areas which are slightly cooler than others. These areas are known as sun spots. Sun spots are still very hot. However, because they are slightly cooler than the rest of the surface of the Sun, they appear slightly darker in color. The gravitational forces in Sun spots are also stronger than the other hotter areas. Of course, you cannot look directly at the Sun to see these spots because you would damage your eyes. Astronomers have to use special telescopes with filters and other instruments to be able to see the cooler spots on the surface of the Sun.

Sun spots come and go on a regular basis. At times, there are very few, if any sun spots. At other times there are far more. They generally increase in intensity and then decrease over a period of 11 years. This 11 year cycle is known as the Saros Cycle.

Size Of The Universe

space~

s

moon

Wednesday, 30 November 2011

How Your Heart Works

Ever­yone knows that the heart is a vital organ. We cannot live without our heart. However, when you get right down to it, the heart is just a pump. A complex and important one, yes, but still just a pump. As with all other pumps it can become clogged, break down and need repair. This is why it is critical that we know how the heart works. With a little knowledge about your heart and what is good or bad for it, you can significantly reduce your risk for heart disease.
Heart disease is the leading cause of death in the United States. Almost 2,000 Americans die of heart disease each day. That is one death every 44 seconds. The good news is that the death rate from heart disease has been steadily decreasing. Unfortunately, heart disease still causes sudden death and many people die before even reaching the hospital.
The heart holds a special place in our collective psyche as well. Of course the heart is synonymous with love. It has many other associations, too. Here are just a few examples:
  • have a heart - be merciful

  • change of heart - change your mind

  • to know something by heart - memorize something

  • broken heart - to lose love

  • heartfelt - deeply felt

  • have your heart in the right place - to be kind

  • cry your heart out - to grieve

  • heavy heart - sadness

  • have your heart set on - to want something badly

  • HUMAN BODY

    http://www.wicked.org.nz/r/wick_ed/topics/human_body/index.php

    THE HUMAN BODY

    1. The human body is made up of a head, neck, torso, two arms and two legs.  The average height of an adult human is about 5 to 6 feet tall.  The human body is made to stand erect, walk on two feet, use the arms to carry and lift, and has opposable thumbs (able to grasp).
    2. The adult body is made up of: 100 trillion cells, 206 bones, 600 muscles, and  22 internal organs.
    3. There are many systems in the human body: Circulatory System (heart, blood, vessels) Respiratory System (nose, trachea, lungs) Immune System (many types of protein, cells, organs, tissues) Skeletal System (bones) Excretory System (lungs, large intestine, kidneys) Urinary System (bladder, kidneys) Muscular System (muscles) Endocrine System (glands) Digestive System (mouth, esophogus, stomach, intestines) Nervous System (brain, spinal cord, nerves) Reproductive System (male and female reproductive organs)
    4.  Every square inch of the human body has about 19 million skin cells.
    5. Every hour about 1 billion cells in the human body must be replaced.
    6. The average human head has about 100,000 hairs.
    7. The circulatory system of arteries, veins, and capillaries is about 60,000 miles long.
    8. The heart beats more than 2.5 billion times in an average lifetime.
    9. There are about 9,000 taste buds on the surface of the tongue, in the throat, and on the roof of the mouth.
    10. The strongest muscle in the body is the tongue.
    11. The human heart creates enough pressure when it pumps out to the body to squirt blood 30 feet.
    12.  You blink over 10,000,000 times a year.
    13. The human brain weighs about 3 pounds
    14.  It takes about 20 seconds for a red blood cell to circle the whole body.
    15. Only 10% of the population are left handed.
    16.  One fourth of the bones in your body are in your feet.
    17.  Children tend to grow faster in the spring.
    18. The most sensitive finger on the human hand is the index finger.
    19. More men are color-blind than women. 
    20. More people have brown eyes than any other color.


    Human Body - Digestive System - Kids Animation Learn Series

    Friday, 25 November 2011

    LAGU GURU MALAYSIA

    Kami guru Malaysia
    Berikrar dan berjanji
    Mendidik dan memimpin
    Putra putri negara kita

    Pada Seri Paduka
    Kami tumpahkan setia
    Rukun Negara kita
    Panduan hidup kami semua

    Di bidang pembangunan
    Kami tetap bersama
    Membantu, membina
    Negara yang tercinta

    Amanah yang diberi
    Kami tak persiakan
    Apa yang kami janji
    Tunai tetap kami tunaikan

    GURU SEBAGAI SATU PROFESION

    Sesungguhnya para pendidik hari ini telah memainkan peranan penting di dalam merealisasikan aspirasi negara dalam mewujudkan perpaduan kaum.Pendidik pada hari ini telah membuktikan bahawa mereka telah mengimbangkan kewujudan integrasi nasional yang menjamin keamanan dan kesejahteraan negara. Guru adalah merupakan ejen kepada keberkesanan pendidikan. Kejayaan dan keberkesanan para guru terhadap tanggungjawab, kelengkapan, keilmuan dan keluhuran peribadi. Mereka berfungsi bukan sahaja untuk memberi kesedaran pada diri sendiri malah juga masyarakat serta  tentang hubungan, komitmen. Perpaduan kaum dapat dicapai sekiranya guru menerapkan nilai-nilai murni seperti saling menghormati antara satu sama lain tidak mengira bangsa dan agama.




    Sejarah tidak pernah menipu manusia dan sejarah telah membuktikan betapa golongan pendidik memainkan peranan yang penting dalam menentukan jatuh bangunnya sesebuah bangsa dan negara.Masyarakat ketika itu menjadikan guru sebagai idola dan pakar rujuk dalam segala hal. Kalau dulu guru terpaksa berhadapan dengan pihak penjajah secara terang-terangan, kini, jajahannya diterjemahkan dalam bentuk yang lain pula iaitu lebih mencabar lagi kerana ia melibatkan jajahan pemikiran, budaya dan jati diri yang perlu dihadapi secara professional dan kreatif.