Friday, 21 December 2012
Friday, 14 December 2012
the water recycle
The Water Cycle
Run and get a glass of water and put it on the table next to you. Take a good long look at the water. Now -- can you guess how old it is?The water in your glass may have fallen from the sky as rain just last week, but the water itself has been around
pretty much as long as the earth has! When the first fish crawled out of the ocean onto the land, your glass of water was part of that ocean. When the Brontosaurus walked through lakes feeding on plants, your glass of water was part of those lakes. When kings and princesses, knights and squires took a drink from their wells, your glass of water was part of those wells.
And you thought your parents were OLD
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The earth has a limited amount of water. That water keeps going around and around and around and
around and (well, you get the idea) in what we call the "Water Cycle". This cycle is made up of a few main parts:
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Evaporation: Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam. The water vapor or steam leaves the river, lake or ocean and goes into the air. |
Do plants sweat? Well, sort of.... people perspire (sweat) and plants transpire. Transpiration is the process by which plants lose water out of their leaves. Transpiration gives evaporation a bit of a hand in getting the water vapor back up into the air. |
Condensation:
Water vapor in the air gets cold and changes back into liquid, forming clouds. This is called condensation. You can see the same sort of thing at home... pour a glass of cold water on a hot day and watch what happens. Water forms on the outside of the glass. That water didn't somehow leak through the glass! It actually came from the air. Water vapor in the warm air, turns back into liquid when it touches the cold glass. |
Precipitation:
Precipitation occurs when so much water has condensed that the air
cannot hold it anymore. The clouds get heavy and water falls back to
the earth in the form of rain, hail, sleet or snow. |
Collection:
When water falls back to earth as precipitation, it may fall back in the oceans, lakes or rivers or it may end up on land.
When it ends up on land, it will either soak into the earth and become part of the “ground water” that plants and
animals use to drink or it may run over the soil and collect in the oceans, lakes or rivers where the cycle startsall over again.source: http://www.kidzone.ws/water/ |
Thursday, 6 December 2012
Friday, 30 November 2012
newton's law of motion
Newton's laws of motion
Redirected from Newton's second law of motion
The laws of motion (laws of inertia) are the three scientific laws which Isaac Newton described; regarding the motion of bodies. These laws are fundamental to classical mechanics.
Newton first defined these laws in Philosophiae Naturalis Principia Mathematica (1687) and, using his newly developed calculus, proved many results concerning "idealised" particles. In the third volume (of the text), he showed how, combined with his Law of Universal Gravitation, the laws of motion would explain Kepler's laws of planetary motion. Newton's laws were modified, in 1916, by Einstein's theory of relativity.
Newton's First Law (Law of Inertia)
Newton's Second Law
Newton's Third Law
sources:n http://encyclopedia.kids.net.au/page/ne/Newton%27s_second_law_of_motion
Newton first defined these laws in Philosophiae Naturalis Principia Mathematica (1687) and, using his newly developed calculus, proved many results concerning "idealised" particles. In the third volume (of the text), he showed how, combined with his Law of Universal Gravitation, the laws of motion would explain Kepler's laws of planetary motion. Newton's laws were modified, in 1916, by Einstein's theory of relativity.
Newton's First Law (Law of Inertia)
- Every object persists in its state of rest, or uniform motion (in a straight line); unless, it is compelled to change that state, by forces impressed on it.
- A body remains at rest, or moves in a straight line (at a constant velocity), unless acted upon by a net outside force.
Newton's Second Law
- Force is equal to the change in momentum per change in time.
- The acceleration of an object is proportional[?] to the force acting upon it.
- F = ma
- F = force
- m = mass
- a = acceleration.
Newton's Third Law
- Whenever one body exerts force upon a second body, the second body exerts an equal and opposite force upon the first body.
- For every action, there is an equal and opposite reaction.
- Forces always come in equal pairs.
sources:n http://encyclopedia.kids.net.au/page/ne/Newton%27s_second_law_of_motion
Friday, 23 November 2012
effects of tsunami
Effects
Tsunamis can Make
1. They can destroy lives/drowned
loved ones. 2. Wash away properties. 3. Wash away and drowned pets. 4. The sound will make you scared and after it happens you might not be able to sleep well because you might hear the sound of a tsunami at night. 5. You won’t have anything to live like: Food, clothes, shelter, beds and blankets. sources: http://library.thinkquest.org/05aug/01824/tsunamicauses.htm |
Friday, 16 November 2012
cause of tsunami
1.
A Tsunami is violent disturbance deep below the ocean surface.
2. The under water earthquakes and subduction zones are the most common cause.
How a Tsunami Is Caused
When an oceanic plate hits a continental plate the plates press together and pressure builds.
Eventually the heavier oceanic plate slips under the lighter continental plate and causes an earthquake.
The earthquake lifts part of the ocean up and drops other parts down.
What happens on the ocean floor is mirrored on the surface of the water above.
The gravity acts fast to even out the water’s surface. The seismic energy created that big wave and it doesn’t just disappear. Waves start moving up to 600 miles per hour but you can’t see them.
The Tsunami extends thousands of feet deep into the ocean.
Tsunamis carry lots of water and energy so they can travel very far.
sources: http://library.thinkquest.org/05aug/01824/tsunamicauses.htmces
2. The under water earthquakes and subduction zones are the most common cause.
How a Tsunami Is Caused
When an oceanic plate hits a continental plate the plates press together and pressure builds.
Eventually the heavier oceanic plate slips under the lighter continental plate and causes an earthquake.
The earthquake lifts part of the ocean up and drops other parts down.
What happens on the ocean floor is mirrored on the surface of the water above.
The gravity acts fast to even out the water’s surface. The seismic energy created that big wave and it doesn’t just disappear. Waves start moving up to 600 miles per hour but you can’t see them.
The Tsunami extends thousands of feet deep into the ocean.
Tsunamis carry lots of water and energy so they can travel very far.
sources: http://library.thinkquest.org/05aug/01824/tsunamicauses.htmces
Saturday, 10 November 2012
what is tsunami?
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Tsunamis are huge waves of water that are usually caused by earthquakes or volcanic eruptions.
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As a tsunami approaches the shore, water may recede from the coast, if it is shallow enough the water may be pulled back hundred’s of metres. If you are in the area, observing this is a good indication that a tsunami is on the way.
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Regions in tsunami danger zones often have warning systems in place to give people as much time to evacuate as possible.
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When tsunamis hit shallow water (often near the coast) they slow down but increase in height.
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In March 2011, the Tohoku earthquake off the eastern coast of Japan caused a tsunami that was a major factor in the death of over 15000 people.
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The tsunami waves created by the Tohoku earthquake reached heights of over 40 metres (131 feet) in some areas, wiping out coastal towns and causing a number of nuclear accidents.
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The Japanese word tsunami literally means ‘harbor wave’.
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Tsunamis are sometimes referred to as tidal waves but this term has fallen out of favour because tsunamis are not related to tides.sources: http://www.sciencekids.co.nz/sciencefacts/earth/tsunamis.html
Monday, 5 November 2012
Saturday, 3 November 2012
do you know who is thomas edison?
Legacy as an inventor
One of Edison’s mentors during those early years was a fellow telegrapher and inventor named Franklin Leonard Pope, who allowed the then broke youth to live and work in the basement of his Elizabeth, New Jersey home.On December 25, 1871, he married Mary Stilwell, and they had three children, Marion Estelle Edison, Thomas Alva Edison, Jr., and William Leslie Edison. His wife Mary died in 1884. On February 24, 1886, he married 19 year old Mina Miller. They had an additional three children, Madeleine Edison, Charles Edison (who took over the company upon his father’s death) and Theodore Edison.
Edison, who made the famous quote, “genius is 99% perspiration; 1% inspiration” eventually invented the light bulb:
Thomas Edison died on Oct. 18th, 1931 in New Jersey at the age of 84 years.
Wednesday, 31 October 2012
Saturday, 27 October 2012
Wednesday, 24 October 2012
acid rain
Rain is very important for life. All living things need water to live, even people.
Rain brings us the water we need. But in many places in the world even where you live, rain has become a menace. Because of pollution in the air, acid gases from factories, cars and homes, the rain is becoming dangerous for the life of every living creature.
This rain is known as 'acid rain'.
WHAT IS ACID RAIN?
The opposites of acid are alkalis; for example, toothpaste and baking powder are both alkalis. Strong alkalis can also be dangerous, such as ammonia and bleach.
Lemon juice, vinegar and cola are all acidic. Rain is naturally acidic, but acid gases make it even more acidic, sometimes as acid as lemon!
Nature can also produce acid gases, such as volcanoes. When they erupt, the smoke that comes out of the crater is also full of acid gases.
source: http://www.clean-air-kids.org.uk/acidrain.html
Saturday, 20 October 2012
your sense of taste
Taste buds probably play the most important part in helping you enjoy
the many flavors of food.
Your taste buds can recognize four basic
kinds of tastes: sweet, salty, sour,
and bitter.
The salty/sweet taste buds are located near the front of
your tongue;
the sour taste buds line the sides of your tongue;
and the
bitter taste buds are found at
the very back of your tongue.
When you were a baby, you had taste buds, not only on your tongue, but on the sides and roof of your mouth. This means you were very sensitive to different foods.
As you grew, the taste buds began to disappear from the sides and roof of your mouth, leaving taste buds mostly on your tongue.
As you get older, your taste buds will become even less sensitive, so you will be more likely to eat foods that you thought were too strong as a child.
source: http://library.thinkquest.org/3750/taste/taste.html
Wednesday, 17 October 2012
MAMMALS
What Makes a Mammal?
There are more than 4,000 different species of mammals. The smallest is the hog-nosed bat, which weighs 0.05 ounces. The largest is the blue whale, which can be 100 feet long and weigh 150 tons. But whether they live on land or water, all mammals share some common characteristics.
All mammals:
- Are vertebrates (which means they have a backbone or spine).
- Are endothermic. Also known as “warm-blooded,” endothermic animals regulate their own body temperate which allows them to live in almost every climate on Earth.
- Have hair on their bodies.
- Produce milk to feed their babies. This allows them to spend more time with their young and teach them important skills they need to survive on their own.
source: http://kids.sandiegozoo.org/animals/mammals
EXAMPLE OF MAMMALS
Thursday, 11 October 2012
The Butterfly Life Cycle
The Butterfly
Life Cycle
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Butterfly Eggs on a Leaf |
The First Stage:
The Egg
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Butterfly Caterpillar |
The Second Stage:
The Larva (Caterpillar)
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Caterpillar Becoming a Chrysalis |
The Third Stage:
Pupa (Chrysalis)
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Butterfly Emerging from a Chrysalis |
The Fourth Stage:
Adult Butterfly
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source: http://www.thebutterflysite.com/life-cycle.shtml
Saturday, 6 October 2012
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