Answers for Sec2Geog WB (Pollution)

Geography WB

Pollution

 

WS 9.1 (Pg 98-99)

 

2 (a) Industries, forest fires, vehicles

(b)

- Industries release large amounts of dust, soot and poisonous gases such as sulphur dioxide and nitrogen oxide.

- Vehicles release smoke and harmful gases such as carbon monoxide and nitrogen oxides

- Forest fires produce dust and smoke

 

(c)

- When we are exposed to dust and smoke for a long time, we can develop respiratory problems such as bronchitis and asthma.

- Breathing in sulphur dioxide and nitrogen oxides over time can increase the risk of developing lung and heart diseases, and even cancer.

- Breathing in carbon monoxide is poisonous and can result in death.

 

(d)

- Flights have to be stopped or delayed. Thus, countries will lose important source of revenue from airport operations.

- Tourists may postpone or cancel their trips to the country thus affecting the tourism industry negatively.

 

(e)

- Harmful gases like these will combine with water vapour in the atmosphere to form acid rain. When acid rain falls over the rivers, the streams and lakes will have lower PH levels. Aluminum that is released into the soil eventually ends up in lakes and streams which will increase the acidity level. This will kill the fishes.

 

-         Acid rain that seeps into the ground can dissolve nutrients that trees need to be healthy, such as magnesium and calcium. This causes aluminum to be released into the soil and makes it difficult for trees to take up water. It makes it easier for infections, insects, and cold weather to damage trees and forests.

  

WS 9.2 (Pg 102-103)

 

1 (c)

When untreated sewage is released into rivers or lakes, these water bodies get polluted because sewage contains human waste, detergents and chemicals which can be harmful if consumed.

 

Sewage that is treated may still contain non-biodegradable substances such as detergents. These substances remain in the water and cause water pollution.

 

2 (a)

A: People may use polluted water from the river or other water bodies for cooking and drinking.

B: People may consume contaminated seafood which comes from a polluted river or the sea.

C: People may come into contact with polluted water when they bathe or swim in the river or sea.

 

(b)

- When we consume contaminated seafood from polluted water, the poisons that accumulate in the bodies of fish and shellfish and passed on to us. This will make us ill.

- When we drink contaminated water, we may suffer from Cholera or Typhoid.

 

(c)

- The oil prevents oxygen from reaching fish in the sea, thus killing them. This will reduce the supply of fresh fish and threaten fishermen’s livelihood.

 

 

 

Elearning: If you still have yet to do the reflections..

Instructions:

Select an issue and click on the hyperlink to read more about it.

Deforestation

Global Warming

Ozone Depletion

Select the thread of the chosen issue and write a short reflection of about 50 words.

Please rem to include your name and class.

1. What is the main message of the article?

2. How will this impact you?

3. What can you do as an individual to solve the problem?

Thank you

Dear girls, It was heart-lifting and encouraging to hear your short reflections on environmental issues that are simply so real to us today that we cannot choose to ignore them. Yes, a simple act of using both sides of a sheet of paper does go a long way. Continue to carry with you this sense of global responsiblity and spread environmental awareness to your family and friends.

Thanks for the effort girls.

Sec 2 Geography Teachers

Deforestation

Post your comments by clicking on ‘comments’ .

Please remember to include your name and class.

Ozone Depletion

Post your comments by clicking on ‘comments’ .

Please remember to include your name and class.

Global Warming

Post your comments by clicking on ‘comments’ .

Please remember to include your name and class.

Updates

Updates: Term 3 Common Test – ‘Agriculture’

Meanwhile, for those who requested for ‘Planting rice is never fun!’ weblink.. Here you go – http://www.moe.gov.sg/edsoftware/ir/files/geo-rice-cultivation/index.html