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Wall Construction
Quiz by Lee Hoernke
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Construction of the Berlin Wall 1 .Sand soil • Has course/ large particles • they are larger than those of clay • Loses water quickly • Has less organic matter • Has good aeration • Allows good root penetration • Leaching of nutrients is more in sand soil. • Does not stick when wet 2. Clay soil • Has very fine particles which are closely packed • The soil is sticky when wet and can be moulded into any shape • It holds more water than sand and loam • It has poor drainage • It cracks when dry • It has poor aeration • It does not allow good root penetration 2 .Loam soil • Is a mixture of sand and clay particles • It half clay half sand • It can be easily moulded into a shape but easily crumbles • Holds water for a longer time than sand • It sticks on the hands when wet • It has good drainage • It has good aeration • It allows good root penetration • Loam is the best soil Soil Fertility • When soil has enough plant nutrients it is fertile • Soil fertility is the presence of nutrients in the soil • A farmer can add nutrients to the soil to make it fertile • This is done by applying fertilizers and compost. • A fertiliser is a substance that is added to the soil to increase fertility • Nutrients found in the soil include Nitrogen, Phosphorus and Potassium ( NPK ) • They are called major nutrients or macro nutrients because they are needed in large quantities Minor nutrients • Minor nutrients are needed in smaller quantities • Minor nutrients are also called micro nutrients or trace elements • Examples of minor nutrients are boron, iron, zinc, manganese, magnesium and molybdenum Soil erosion • Is the washing away of top soil by agents such as Water Wind Animals Humans 1. Water: • Water washes away soil when it rains. • Loose soil is washed away into dams and rivers. • Steep slopes also lead to soil erosion. • Ploughing 2 . Wind • The blowing away of soil by wind causes soil erosion. • When people cut down trees wind erosion easily takes place. • Type of soil also leads to wind erosion. Which soil type is easily eroded by wind? 3 . Animals • Animal cause soil erosion by overgrazing. • Overgrazing is when animals eat plant or vegetation leaving the ground surface bare. • Animals walking on the same pathway for a long time make the soil loose. • Animals that live underground also burrow loosening the soil. • This makes soil break easily and get washed away. WATER WATER CONSERVATION Water • Water is important in agriculture • It is used to: Clean farm tools Mould bricks Wash milking equipment Cool machines Provide homes(habitat) for fish Give animals drinking and bathing water Sources of Water Natural sources 1. Natural rains: • rain water from the clouds is a primary source of water. • It is used to water crops such as maize, millet, sorghum and so on during the rainy season. • Rain water that collects into the rivers and dams is used by animals and people for drinking. 2 . Rivers : • Rivers are some of the major sources of water for different activities such as fishing, boat cruising and irrigation. 3 . Streams : • A stream is a small river. • Streams supply water for irrigating garden crops especially in rural areas. • They are also a source of water for animals to drink and bath. Sources of Water 4 . Springs : • Springs are usually found on hilly areas. • They result from pressure of underground streams. • The pressure forces water underground to form a channel to the surface of the soil and flow above the ground. Sources of Water Man made sources Man discovered that water for agriculture was not enough during the rain and cool dry seasons. They decided to make structures which would harvest or collect and store water for future use. 1.Protected well: • Wells are dug in the ground by hand. • They are often lined with bricks and concrete so that they do not cave in. • Protected wells are covered, therefore are safe to drink from. 2 . borehole : • They are deep holes made by drilling machines. • Drilling can be done up to 70 metres deep. • Water is pumped using an electric pump or hand pump. Sources of Water 3 . Dams : • A dam is a large wall or barrier built to hold water to save it for future use. 4 . Weir : • A weir is made by construction a cement brick wall or concrete wall across a river to trap water and eroded soil. • water flows over the wall when the river is inflood. 5 .Water tank : • Is a temporary manmade water source. • Water from a water tank is usually harvested from roof tops or it works along a borehole or protected well as temporary storage. • Water is pumped from the borehole or protected well into the water tank. 6 . reservoir : • A large natural or manmade lake used as a source of water. PLANTS Uses of plants • Fibre for making clothes • Oil for cooking, making paint and chemicals • Sugar for tea • Wood for timber • Refreshing drinks and alcohol • Food for people and animals • Protect the soil from erosion • Plants supply us with fresh oxygen for breathing. • Some plant parts are used as medicine.Important Preparations Before an Earthquake Strikes • Follow the structural design and engineering practices when constructing a house or building. • Evaluate the structural soundness of the buildings and houses: strengthen if necessary. • Be aware of the earthquake evacuation plans for all of the buildings you occupy regularly. • Strap or bolt heavy furniture and cabinets to the wall to keep them in place. • Breakable items, harmful chemical, and flammable materials should be stored properly in the lowermost secure shelves • Prepare and know where fire extinguishers, first aid kits, alarms, and communication facilities are located and learn how to use them beforehand. • Pick safe places in each room of your home, workplace, and school and practice doing drop, cover, and hold.Essential Things to Do While an Earthquake is Happening • Stay calm. • Duck under a sturdy desk or table and hold onto it. Protect your head with your arms. • If there is no sturdy furniture, sit on the floor in a corner next to an interior wall and cover your head and neck with your arms. • Move away from glass windows, sliding doors, shelves, cabinets, and other heavy objects. • Grab anything handy to shield your head and face from falling debris and splinting glass. • Stay indoors until the shaking stops. If you must leave the building. use the stairs rather than elevators. • Stay away from trees, power lines, posts, and concrete structures and proceed cautiously to an open area. • Move away from steep. slopes, which may be affected by landslides. • Move quickly to higher grounds since tsunamis might follow • Pull over to a clear location and stop. Avoid bridges, overpasses, and power lines, if possible. • Be updated about disaster. prevention instructions from battery operated radios.Essential Safety Measures After an Earthquake • Check yourself and others for injuries. • Do not panic. • Expect and prepare for aftershocks. These aftershocks may be weaker but they may sometimes cause more damage than the major earthquake. • Look for emergency supply kits. They should include food, water, medication, clothing, and other things you may need. • If you need to evacuate, leave a message stating where you are going • Do not enter damaged buildings since they might have weakened foundations, increasing their susceptibility for collapse. There can also be a lot of falling debris. • Do not use elevators • Check water and electrical lines for damages. Turn the main switch off to avoid any incidences of electric shock • Look for and extinguish fires to reduce their chances of spreading. • Avoid fallen power lines. • Tune in to radio broadcasts and be updated on disaster prevention instructions.Water harvesting and storage Water is very important for life on earth. People, plants and animals all need water to live. There is always not enough water in rivers and streams for farmers to use. Water harvesting is collecting rain water and storing it to be used later. We can divert rivers and build structures such as dams and tanks to store water. METHODS OF WATER HARVESTING 1.Harvesting from rooftops: Rainwater that fall on roofs, roads and pavements can be collected, instead of letting it run into the ditches. One way to do this is to use water storage tanks. Rain runs off the roof into the gutter and then into the water tank. 2. Damming rivers. Farmers may also build dams to store water to use to irrigate their crops and water their livestock. Some communities block rivers to harness water. The water might be pumped into tanks They can then use the water to water their crops and animals to drink 4. Making pits and open reservoirs •If water tanks are too expensive, people can dig big pits and make open reservoirs. •These reservoirs not only collect rainwater, but also allow rainwater to seep into the ground and raise the ground water level. 5. Road drains Rain water can be harvested from roadside drains then led to storage tanks or encouraged to sink into the soil to increase the water table 5. Harvesting rain water from rock outcrops Rain water can be harvested from the rock outcrops by constructing a small wall to block the water and lead it to the tanks WATER STORAGE FACILITIES 1. Tanks – stores water to reduce evaporation and protect it from algae 2. Reservoirs – also reduces evaporation and algae 3. 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