5. is used as a fuel for enginevs and generators. 6. Petroleum is found locked in rocks deep below the Earth’s crust.
7. Natural gas is than air and mainly consists of .
8. is an alternative to petrol used to run vehicles.
9. is the chemical derived from petrol and natural gas.
10. Carbon dioxide emission is responsible for effect.
11. Principle is used to minimize the consumptions of non-biodegradable materials.
12. can lead to melting of the polar ice caps
II. Match the following:-
13. Natural gas a. Candles
14. Plastic b. Emission of carbon dioxide
15. Paraffin wax c. Non-biodegradable
16. Global warming d. Aviation fuel
17. Petrochemical e. CNG
III. State whether the following are true or false:-
18. Oxygen in air is an exhaustible natural resource.
19. Resources which are present in unlimited quantity in nature are
Called exhaustible natural resources.
20. Under high temperature and pressure, dead plants get slowly converted to coal.
21. CNG is less polluted fuel than petrol and diesel.
22. It is not important of conserve fossils fuels.
IV. Choose the correct -
23. Which of the following is not a natural resource?
a. Minerals b. Water c. Soil d. Plastic
24. Which of the following is pair of exhaustible natural resources?
a. Coal and soil b. Air and sunlight c. Water and petroleum d. Wildlife and minerals
25. Which of the following is not obtained from coal?
a. Coke b. Coal tar c. Coal gas d. CNG
26. Coal is formed from the remains of .
a. vegetation only b. animals only c. both vegetation and animals d. neither vegetation nor animals
27. Petroleum was formed from organisms:
a. Living on the land b. Living on the plants c. Living in the sea d. Living on the rocks.
V. Give one word for the following:
28. The process of the conversion of dead vegetation into coal.
29. It is also known as brown coal.
30. It is a mixture of hydrogen, methane and carbon dioxide.
31. Components obtained from refining of petroleum.
32. It is used as a solvent for dry cleaning.
33. It is used for surfacing of roads and in plants.

according to the u.s. department of agriculture, the label of "certified organic" comes with a set of highly regulated standards for environmental stewardship and resource conservation. some of these include maintenance and improvement of soil quality, prevention of ground and surface water contamination, greenhouse gas regulation, encouragement of biodiversity and conservation of water and energy (see references 1). organic practices integrate natural methods such as mulching, plant diversity, native and adapted plants, crop rotation and the introduction of beneficial insects to control pests without synthetic pesticides.

environmental implications of pesticides

synthetic pesticides ensure high crop yields. while effective in achieving this goal, pesticides contaminate soil, air, ground and surface water, as well as the plants and animals that come into contact with these contaminated sources. freshwater and marine organisms are particularly susceptible to pesticides through agricultural runoff. pesticides also reduce soil fertility (necessitating the use of synthetic fertilizers) and can travel far from the original source, contaminating water and air hundreds of miles from the location of application (see references 2).

health implications of organics

although a subject of particular debate, many recent findings show that organic food is healthier than conventionally grown food. according to the usda, an extensive european union-funded study found that organically grown foods contain more beneficial compounds, such as the vitamins and antioxidants needed to combat many diseases (see references 5). organic milk, meat and eggs are regulated to ensure they are free of hormones administered to conventional livestock and poultry.

health implications of pesticides

pesticides affect human health in three ways: through skin contact, inhalation and ingestion. acute and long-term exposure to pesticides can cause serious health problems for farmers who apply them. the majority of other people are affected by drinking contaminated water and eating contaminated marine life (see references 3). pesticides have been linked to neurological disorders, endocrine and reproductive disorders, immune system deficiencies and cancer. according to the world health organization, acute pesticide poisoning (app) is responsible for significant annual mortality, especially in developing nations (see references 4).

other important considerations

not every small farm or business owner can afford the costly certification process required to be considered "certified organic," even if the farm is not using chemicals. "transitional" farms include those that once used chemicals and are now transitioning to organic-only production. in addition, though organic farming methods offer obvious environmental benefit, an organic apple shipped from around the world creates a different set of environmental problems. locally grown food (particularly locally grown, organic food) is key in sustainable food production.

1. they vary with a higher number because boiling is way hotter than melting