Grade 5 | Science | Unit 3 - Concept 2 - Lesson 4 - Conservation, Preservation And Sustainability

Описание: Welcome dear students!
• There are many things we use every day that are made from natural resources.
• It is important to conserve (which means to protect or preserve) these natural resources, so there will be enough when we need them.
Natural resources: Trees :
Objects made from natural resources: Paper is made from trees.
Natural resources: Oil products :
Objects made from natural resources: Most plastic is made from oil products.
Natural resources: Plant and animal products :
Objects made from natural resources: Clothes are made from plant such as cotton and animal products such as wool of sheeps.
Humans can conserve natural resources in different ways such as :
1. Preservation.
2. Sustainability.
1 Preservation
Preservation of resources means restricting access (control reaching) of humans to these natural resources or using them.
Example of resources preservation:
Countries prevent using or developing of natural resources in some protected areas of land such as:
• Ras Mohammed Protectorate in South Sinai.
• Wadi Al-Hitan Protectorate in Fayoum.
The following table shows the results of overusing (depletion) some natural resources more quickly than they can be replaced:
Natural resources: Fish
Results when using them more quickly: If the catch of fish by humans (overfishing) is more than the fish that are replaced by their reproduction in oceans and seas, they become rare and fishing will decrease.
Natural resources: Groundwater
Results when using them more quickly: If groundwater of wells are used faster than they are replaced by rains, the groundwater will run out and the wells will become dry.
2 Sustainability
• Sustainability is an important way of resources conservation.
• Sustainability means using natural resources in a way that does not negatively affect the future supply of these resources.
Example of resources sustainability:
Cows feeding on grass in a field where grass grows slowly.
Unsustainable situation
If cows are placed in many small areas of grass, they begin eating all grass before new grass could grow in these areas.
This causes the disappearance of grass in these areas and the cows will be very hungry.
Sustainable situation
If cows are placed in one large area of grass so, the cows still have more food.
This causes the grass to grow back in other areas.
Notes
1. Preservation of natural resources means prevent using or developing natural resources in special areas.
But, when people manage the use of natural resources without negative effects on their amount in future this is called sustainability.
2. Resource sustainability is affected by many factors such as:
• Overpopulation.
• Unequal distribution of resources.
• Overuse (overconsumption) or damage of resources.
• Pollution.
Give a reason for:
Countries prevent using or developing natural resources in some protected areas of land.
To preserve natural resources.
Renewable does not mean unlimited
Natural resources can be classified into:
• Renewable resources such as water, plants, animals ... etc.
• Nonrenewable resources such as oil, coal ... etc.
Renewable resources can be used up if people don't use them wisely.
Examples:
• When fresh water (renewable resource) on Earth is polluted, it becomes undrinkable.
• Pollution from burning of nonrenewable resources like coal and oil leads to soil pollution that causes the death of plants and animals (renewable resources).
Cutting down too many trees (renewable resource) leads to deforestation so, water and wind can carry away soil causing soil erosion.How Much Water Do You Use ?
• From the previous activity you have learned that water is considered a renewable natural resource.
• Drinking water is important for humans to survive, but there are many activities in our daily life that require water such as :
• Taking a shower.
• Washing hands.
• Cooking food.
• Brushing teeth.
• Flushing a toilet.
• Watering plants.

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Mr. Raouf Ashraf