q4

• physical weathering is the physical wearing away of rock by water and temperature . When rocks are broken down into smaller pieces of the same material without changing its composition
• chemical weathering takes place when the rocks mineral are changed into different substances
• When rocks are broken down into different pieces it does not stay in one place. Some rocks become a part of soil while others transferred from one place to another. Once the rock fragments and soil moved from one place to another that is called erosion
• agents of soil erosion example water wind animals human
• animals can cause erosion by digging burrows which weaken the ground above them. They may also eat plants on hillsides causing the soil to wash away during heavy rainfall
• wind can also be an agent of erosion because it blows sand, dust, gravel and other loose materials around. It can carry these particles long distances and deposit them somewhere else
• water can be an agent of erosion because it carries sediments with it as it flows over land or under the sea.
• Natural vegetation it allows plants to grow naturally without human interfere
• soil erosion occurs when the top layer of soil is removed faster than new soil forms
• contour plowing it is the technique which is in a curve form.
• terracing involves planting on terraces or steps built on the slopes of mountainside
• strip cropping is a method involves alternately planting different crops in strips
• rip rapping building of chunks of stones or rocks arranged on the edge of the slope
• crop rotation planting different crop after harvesting another crop