State of matter

1. Matter can be grouped as ________, __________ or _________.
2. _________is a process where a solid changes to a liquid.
3. __________ is a process where a liquid changes to a gas at its boiling point.
4. ___________is a process where a liquid changes to gas at any temperature. This process takes place at the surface of the liquid.
5. ___________is a process where a gas changes to a liquid.
6. ___________is a process where a liquid changes to solid.

The water cycle

 What is the water cycle?

1. In the air, water form clouds.
2. On land, water forms lakes, rivers and seas.
3. Water is also kept in our body, animals and plants.
4. Water cycle is the way water movers from the land into the air and back to the land again.
5. The water cycle helps to clean or purify the water used for our daily activities.
6. Most importanly, the water cycle ensures that we have enough supply of water.
7. The water cycle also makes sure that the amount of water on Earth remains the same.
8. The water cycle also helps to cool the Earth.

蝴蝶——一个美丽的心灵成长故事

  说到蝴蝶，对于我们每个人来说都不陌生。蝴蝶的一生是非常短暂的，也是非常美丽的。他很像一个人的一生，要经历很多的波折和挣扎，才能获得个人的成长。我认为，蝴蝶的每个成长历程，从卵、幼虫、茧到蝴蝶，每个阶段都是非常重要。

   每个人在成长的过程中最需要的就是亲人的爱和温暖。当体验到爱与温暖的时候，人会产生一种自己被人爱，被人重视、从而产生活着是非常有意思的、非常有价值的。然而，这种感觉是需要时间慢慢培养出来的，就像一颗种子发芽，一棵小幼苗的成长过程一样漫长。它需要有合适的土壤，施肥，除草等。一棵小树苗才能慢慢长大。

  http://www.youtube.com/watch?v=aAQ5NV2fODY

Test your self

Put a tick (V) for the correct statement and a cross (X) for the wrong statement.

1. Cows take care of their young.     (     )
2.Hens do not take care of their eggs and young.     (     )    
3.Birds feed their young.   (      )
4.Most animals that do not take care of their young lay a lot of eggs.  (     )  
5. Species are different types of living things that can breed among themselves. (     )      

Survival of the species

Animals need to reproduce to prevent their species from extinction. Animals reproduce by eggs or giving birth. Different animals have their own ways to ensure the survival their species.

1. Snake coils round the eggs and attacks animals that come close to the eggs.

2.Sea horse

The male sea horse use its pouch to store the eggs and looks after them until the hatch. It will protect the young until they can fend for themselves.

3.Siamese fighting fish

The male fish catches the eggs in its mouth and drops them into a bubble nest that it has built. It also guards the nest and protects the babies.

4. Kangroo carry their young in their pouches

                              

Effect of heat

Q: This ping-pong is dented! Do i have to throw it away?

A: No, you can put it in hot water.The air in the ping-pong ball will expand and the dent on the ball will be gone.

When a dented ping-pong ball is placed in a bowl of hot water, the air in the ping-pong ball will absorb heat and expand. As the air expand, it will push the dent outward making the ball return to its original shape.

Light

1. Light is a form of energy.
2. Light travels in a straight line.
3. Light cannot pass through opaque or translucent objects.
4. When light is blocked by opaque or tranlucent objects, shadows are formed.
5. Light can pass through transparent objects. 
6. The nearer the object is to the screen, the smaller is the shadow on the screen.
7. The nearer the object is to the source to light, the larger is the shadow on the screen.
8. A sharp image is formed when the light is reflected from a smooth and shiny surface.
9. Aburred image is formed when the light is reflected from a rough surface.
10. The most important use of light reflection is that it enables to see things that are difficult to look at directly.