Answer Keys Activity 5: Unit Module A Activity 1: a G reenfreeze is the world’s first ozone safe technology for domestic refrigerators b The advertisement is warning us about ozone layer depletion c Greenfreeze doesn’t affect the ozone layer d Industrial chemicals called halocarbons are destroying the ozone layer e S uggested answer: Avoid using aerosols, cars and pesticides reduces pollution from certain products such as car oil and batteries; prolongs the life of limited reserves of other natural resources such as wood; saves energy: gives jobs to hundreds of people by creating new industries Activity 6: Students’ own answers Unit Module B a . has already taken place b reported existing alternatives to CFCs and other ozone depleting chemicals c non-toxic d . contributes to avoid ozone layer depletion e . without harming the ozone layer Activity 3: plastic paper and card a a ir pollution, noise pollution, water pollution b The telephone is ringing, his sister is playing the drums, his mother is calling them, his mp3 headphones are at top volume c hypertension, stress, sleep disturbances and hearing loss d It can cause death to several species, and some may become extinct; whales may get stranded on the beach Activity 2: food waste a think; b doesn’t; c can be; d can’t Activity 3: a 1, 2, 3, 4; b 1, 2, 3, 4; c 2, 3; d 2, glass, cloth and metal Activity 4: Activity 4: Students’ own answers Activity 5: Students’ own answers a c d b Unit Module A Activity 1: a 4; b 3; c 1; d English Toolkit - Natural Sciences Photocopiable © Ediciones Santillana S.A / Richmond 2011 Activity 1: Activity 2: Answer Keys Activity 2: a F ossil fuels are remains formed millions of years ago from plants and animals that died and disintegrated under tons of soil and rock The most important types are coal, oil and natural gas b Coal is used to produce electricity Oil enables us to use means of transport Natural gas is mainly used to produce heat, for industrial processes and, in some countries, it is used as fuel as well Nationality: French Occupation: chemist and microbiologist Theory: the relevance of germ theory to infectious disease, surgery, hospital management, agriculture and industry / germ theory of disease Early 1860s: began working on fermentation Demonstration: yeast is a microorganism that converts sugar into alcohol Discovery: pasteurisation Activity 4: Students’ own answers Activity 3: Activity 5: a T; b T; c F; d F Activity 4: a 5; b 1; c 4; d 2; e 6; f Unit Module A Activity 5: Suggested answers: a Natural gas is mainly used for heating and industrial processes.; b Lights in a room contribute to global warming Activity 6: Students’ own answers Activity 1: They show a forest fire, a tornado and a volcano A forest fire may happen naturally or be caused by man A tornado and a volcano eruption happen naturally Students’ own answers Activity 2: Unit Module B Activity 1: a T; b F; c T; d F; e F; f T; g T; h F Activity 2: a physician; b fever; c work; d techniques; e disease; f ordered; g greatly; h views Activity 3: Name: Louis Pasteur Born in: 1822 Died: 1895 a T he greenhouse effect is a natural phenomenon but it is enhanced by man b Because the process is the same as that in a greenhouse c It leads to an increase in the levels of greenhouse gases (carbon dioxide, methane, nitrous oxide, water vapour and chlorofluorocarbons) in the atmosphere d G lobal warming has changed the Earth’s atmospheric balance with effects in Polar Regions Part of the ice caps is melting, raising the height of the world’s oceans and producing floods in low-lying areas of the world English Toolkit - Natural Sciences Photocopiable © Ediciones Santillana S.A / Richmond 2011 Students’ own answers Answer Keys e T he causes of global warming are human activities such as the burning of fossil fuels, deforestation, the use of fertilisers in agriculture, decomposition of garbage and the use of refrigerators and air conditioners Activity 3: Students’ own answers Activity 4: Students’ own answers Activity 3: a increase; b cool off; c atmosphere; d balance Activity 4: Unit Module A Activity 1: a 1; b 3; c 4; d a 3; b 1; c Activity 5: a .radiating heat energy (infrared radiation) back up towards space.; b …the levels of greenhouse gases (carbon dioxide, methane, nitrous oxide, water vapour and chlorofluorocarbons) in the atmosphere.; c …the enhanced greenhouse effect.; d …the enhanced greenhouse effect / global warming.; e …has affected the Polar Regions.; f .floods in lowlying areas of the world a Correct; b Turbines transform wind into power but they need to be installed where wind blows at constant speed.; c Hydroelectric plants kill fish because they change water level and temperature.; d Rubbish pollutes the air when it is burned Activity 3: Source of energy Advantages Disadvantages sunlight unlimited / non polluting only available where sun wind provides power for many only available where wind people blows at constant speed water inexpensive / non polluting affects ecology rubbish abundant / cheap highly polluting Activity 6: shines Students’ own answers Unit Module B Activity 1: Activity 4: Students’ own answers Students’ own answers Activity 2: a .addicted to baseball.; b .went to the game.; c .practises sports all day long.; d .steroids are very dangerous.; e .perhaps Ed just loves sports Activity 5: Students’ own answers Activity 6: Students’ own answers English Toolkit - Natural Sciences Photocopiable © Ediciones Santillana S.A / Richmond 2011 Activity 2: Answer Keys Unit Module B Activity 1: Students’ own answers Activity 2: a B ulimia and anorexia b The ideal of a perfect body c Mass media, peers’ influence, excessive concern, obsession with physical appearance, a distorted body image, society… Activity 3: Activity 4: a 7; b 4; c 1; d 2; e 6; f 5; g 8; h Activity 5: Students’ own answers Activity 6: Students’ own answers English Toolkit - Natural Sciences Photocopiable © Ediciones Santillana S.A / Richmond 2011 a 3; b 2; c 1; d 4; e