Saturday, 27 October 2012
Wednesday, 24 October 2012
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.
Saturday, 20 October 2012
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.
Wednesday, 17 October 2012
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.
- 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.
EXAMPLE OF MAMMALS
Thursday, 11 October 2012
Butterfly Eggs on a Leaf
The First Stage:
The Second Stage:
The Larva (Caterpillar)
Caterpillar Becoming a Chrysalis
The Third Stage:
Butterfly Emerging from a Chrysalis
The Fourth Stage: