$CATEGORY: Science - Khan Academy/15.Our Environment/15.Our Environment--How Do Our Activities affect the Environment

//Multiple Choice

What is the function of the ozone layer? {
    ~To provide oxygen for respiration
    =To absorb ultraviolet rays from the sun
    ~To regulate temperature on Earth
    ~To trap greenhouse gases
}

Which of the following gases is primarily responsible for the depletion of the ozone layer? {
    ~Carbon dioxide (CO₂)
    =Chlorofluorocarbons (CFCs)
    ~Methane (CH₄)
    ~Nitrogen (N₂)
}

Which part of the Earth’s atmosphere contains the ozone layer? {
    ~Troposphere
    =Stratosphere
    ~Mesosphere
    ~Thermosphere
}

What are the harmful effects of ozone layer depletion? {
    ~Increased global warming
    =Increased UV radiation leading to skin cancer
    ~Decreased photosynthesis in plants
    =All of the above
}

Which of the following is the main cause of ozone depletion? {
    ~Water vapor
    ~Sulfur dioxide
    =CFCs and other ozone-depleting chemicals
    ~Nitrogen oxides
}

//True or False

The ozone layer is found in the troposphere. {F}

CFCs break down the ozone molecules in the stratosphere. {T}

The ozone layer prevents the entry of harmful ultraviolet (UV) radiation into the Earth's surface. {T}

The depletion of the ozone layer leads to an increase in skin cancers and cataracts. {T}

The ozone layer is being rebuilt after the ban on CFCs was implemented. {T}

//Fill in the blanks



//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Ozone Layer -> Absorbs UV rays, protects life on Earth
=Main cause of ozone depletion -> CFCs, halons, and other chemicals
=Harmful effects of ozone depletion -> Skin cancer, cataracts, and environmental damage
=Chemicals responsible for ozone depletion -> Stratosphere 
}


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