Ozone Depletion
Gbogbo ọrọ náà
High in the stratosphere, a thin band of ozone acts as the planet's sunscreen, soaking up most of the Sun's harmful ultraviolet radiation before it can reach us. For decades, gases from everyday products such as aerosol sprays and refrigerators drifted up to this layer and quietly tore it apart, opening a seasonal hole over Antarctica. It is a striking example of how a useful invention can have an invisible global cost.
In this lesson you will learn what causes ozone depletion, how chlorofluorocarbons (CFCs) release chlorine that destroys ozone, and why the result is more ultraviolet radiation at the surface, with consequences for human health and crops. You will also study how the world responded, through international agreement, a ban on CFCs and the safe disposal of old equipment, and you will see why this is one of the great success stories of environmental management. Crucially, you will learn to keep ozone depletion firmly separate from the greenhouse effect.
Ebumnobi
- 4.4.1 State that chlorofluorocarbons (CFCs) in aerosols and refrigerants are the cause of ozone depletion in the ozone layer.
- 4.4.2 Describe the impacts of ozone depletion, limited to: (a) higher levels of solar radiation reaching the Earth’s surface (b) increased rates of cancer and cataracts (c) damage to vegetation resulting in reduced crop yields.
- 4.4.3 Describe strategies to manage the impacts of ozone depletion, limited to: (a) international agreement and policies (b) CFC ban and alternatives to CFCs (c) safe disposal of CFCs.
- 4.4.4 Discuss the benefits and limitations of strategies to manage the impacts of ozone depletion.
Nkuzi Olu
Gee ntị na nkuzi a na ngwa
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Ozone Depletion. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which gases are responsible for ozone depletion? A. Carbon dioxide and methane B. Sulfur dioxide and oxides of nitrogen C. Chlorofluorocarbons (CFCs) D. Oxygen and nitrogen Answer: C
- CFCs were commonly used in: A. Power stations and factories B. Aerosols and refrigerants C. Vehicle engines D. Cement manufacture Answer: B
- Ozone depletion leads to: A. Less ultraviolet radiation reaching the surface B. More ultraviolet radiation reaching the surface C. Rising sea levels D. Acid rain Answer: B
- Which international agreement was created to control CFCs? A. The Kyoto Protocol B. The Paris Agreement C. The Montreal Protocol D. The Rio Earth Summit Answer: C
- Which health problem is linked to increased ultraviolet radiation from ozone depletion? A. Asthma B. Skin cancer C. Diarrhoea D. Dementia Answer: B
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Ozone Depletion? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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Ihe nile ichoro iji nwee ihe ịga nke ọma na JAMB, WAEC & NECO.
