9. Endangered Ecosystem

9.1 Human Activities that Endangered an Ecosystem

What are the humans activities that threatened the ecosystem?What are the impact of human activities on the ecosystem?

Pollution Pollution - Any undesirable change in the natural environment caused by pollutant.

Pollutant substance that cause pollution

Types of environmental pollution:Air pollutionWater pollutionSoil pollutionPollution caused by solid waste and hazardous (dangerous) wasteNoise pollution

Formation of acid rain

Effects of acid rainCorrodes metals, rubber, plastics and other materials.Destroyed plant tissues and damages plant roots.Reduces the pH value of the soil making it unsuitable for farming.Increase the acidity of aquatic ecosystem ( kill the planktons and aquatic organism)

9.2 The Greenhouse Effects and the Thinning of the Ozone Layer

Greenhouse effectOccur when greenhouse gases accumulates in the atmosphere to form a layer of gasesGreenhouse gases carbon dioxide, chlorofluorocarbon, nitrogen oxides and, methane The layer of gases trap the Suns heat around the world Greenhouse effect cause the global warming

Global warming: the increase in the average temperature of the earthHigh temperature causes drought occursMore inland lakes and rivers may dry up and deserts may expandMelting of polar ice (cause a rise in sea level)Flood occurs at low and areas as the level of the sea rises

Consequential of greenhouse effect

Greenhouse Found in temperate countries Use to grow plants and vegetables The heat from the sun is trapped inside and this keeps the soil and air warm

Greenhouse gasesCarbon dioxideMethaneNitrous oxideCFCs

Solutions to global warmingReduce the burning of fossil fuel to conserve energyDevelop alternative sources of energyReduce deforestationReplant trees which had been cut down

Ozone layerlocated in the atmosphere.consist of ozone molecules which made up of three oxygen atom (O3).act as protective shield that absorb the Suns harmful UV radiation

Thinning of ozone layerMain cause - chlorofluorocarbon (CFC)CFC man made gases used as refrigerant (substance that make things cold or freeze) and propellants (compressed gas that forces out the content of an aerosol container)CFC when exposed to UV radiation will release chlorine atom which can break down ozone molecules in chain reaction causing the ozone layer become thinner.

What are the impact of global warming and the thinning of ozone layer on the ecosystem?

9.3 The Importance of Proper Management of Development Activities and the Ecosystem

The need for development and the effects of an increasing population on the ecosystemThe increasing in population cause the increase in development.Development interfere the balance in nature.Unplanned and unmanaged development cause environmental problems.Proper management of development activities are important

The importance of proper management of development activitiesNatural resource are non-renewable means once they have been used they cannot be replaced.They need to be manage in proper ways to maintain balance in nature.Uncontrolled use of the natural resources will cause them to be used up.

Carry out sustainable development to balance the demands and the needs for resources with the need to conserve the resources.

The importance of proper management of development activities

Measures taken in the management of development activitiesImplementation of lawsUse of technologyEducation on the management of resourcesPreservation and conservation activitiesThe practice of biological control

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