Lesson about soil

Hi there guys!, today we have just finished another unit about soil. In this unit, we learn how soil form and what and how to prevent soil erosion. I now have known how do soil form. There are 7 ways how soil is formed:

• Wind
• Waves
• Water
• Plants and animal
• Human activities
• Frozen water
• Heat from the sun

The explanation for it is too long so, let's just move on to the next part: Soil erosion. There are 3 factors that affect soil erosion: Slope of land, Amount of vegetation and Speed and volume of running water. If the slope of a hill is steeper, the easier soil can be eroded or washed away. If there are small amount of vegetation at an area, soil in that area is more prone to soil erosion because plant protect soil from rain because, roots of the plants bind the soil together. The bigger the volume of water and the faster the water flow, the more soil is eroded.There are 3 ways to prevent soil erosion: Stop cutting down trees unnecessarily because it expose the soil to heat and rain, grow plants and corps along the slopes of hill and mountains and build retaining walls to hold back slopes of hills and mountains and I guess, I have revise the unit too much so,
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Electric circuit project

Hi there, I have just finish another science project. We have just made a series and parallel electric circuits. As you see in first picture above, I'm the one with glasses holding the electric circuit in the far right. To make them, it takes a long time. Actually, only the parallel circuit that makes the whole project takes a long time. There are 2 differences between the 2 circuits. in series circuit, if 1 bulb has blown out, the other bulb will also died. But, in parallel circuit, if one of the bulb is blown, the other will still lives. OK, now back to the project.  what we need to build a parallel and series circuit, we need at least 25 alligator clips, 5 bulbs, 4 batteries, 2 battery casing, 4 bulb casing and some wires. I will not explain here how to make it because it will be too complicated, you can just browse to find it. As the result of my project, I succeed to make it but, I got some problems while connecting the wires to the alligator clips because its very hard to open the rubber covering to expose the copper and then putting it into the hole of the alligator clips and then twisting it and then covering the alligator clips again. But, the important thing is that I succeed. I now also know the difference between series and parallel circuit. but now, Think writing time is over, so now I will publish it.