Soil erosion   
What is Soil erosion?
Soil erosion is the removal of soil by wind and rain. Soil erosion occurs when soil gets blown by the wind or washed away.
What is the causes of soil erosion?
The causes of soil erosion is weathering of rocks,wind,waves,water,heat from the sun,plants,animal,frozen water and human activities.
What are the effects of soil erosion?
The effects of soil erosion is the shape of land,condition of soil and condition of water.

 How can we prevent soil erosion?
we can prevent soil erosion by stop cutting trees unnecessarily as this exposes the soil to the sun, rain and wind, grow plants and crops along the slopes of hills and mountains and build retaining walls to hold back slopes of hills and mountain

Improvised Telephone

Steps to make the telephone:

1.Make a hole on the bottom of the cups.

2.Put a long string on the hole and tie the string  tightly so it might be connected to the second cup.

3.Do the same thing to the second cup so  it might be connected.

4.Go far to the second cup until the string is straight.
5.Try to talk into the cup and if it is working,congratulations!
conclusion
If we want to communicate with a cup, we have to tie the string strongly into the cup and it should be straight so we can hear each other.
Reflection
I like this activity because it is fun making the telephone and i can learn more about sound energy. Our group try very hard to make the the hole in the cups because we don't have any cutter. In making the telephone, we need to be concentrate in tying the strings. I love this project!