13.5

Question 1

properties of renewable natural resources

Answer 1

replaced by natural cycles as long as humans do not overuse them

Question 2

properties of non renewable natural resources

Answer 2

takes millions of years to form naturally, cannot be replaced quickly enough

Question 3

what is mans negative impact on environment

Answer 3

man is depleting earth’s natural resources

Question 4

why are forests cleared (5 points)

Answer 4

-urban development to build houses, roads and factories
-grow crops
-farming livestock
-firewood is a source of fuel
-wood is used as construction material and turned into pulp for making paper

Question 6

undesirable effects of deforestation? (2 points)

Answer 6

extinction and reduction in biodiversity, global warming

Question 7

how does deforestation lead to extinction and reduction in biodiversity

Answer 7

leads to habitat destruction for many species of animals, remaining forest land is not big enough to support a breeding population of these animals, animals become endangered or extinct, loss of biodiversity

Question 8

how does deforestation lead to global warming (7 points)

Answer 8

forests are carbon sinks, when trees are cut down, they release into the atmosphere through decomposition and combustion, all the carbon dioxide they have been storing. when trees are left to rot or burn, more emissions of carbon dioxide. decrease in trees results in decreasing rate of photosynthesis by trees in forests, decreasing rate that carbon dioxide is removed from atmosphere, increase concentration of carbon dioxide in atmosphere, lead to global warming

Question 9

greenhouse effect (3 points)

Answer 9

-enhanced greenhouse effect may result in climate change
-raise in seawater temperatures may result in a loss of biodiversity (coral bleaching)
-rising atmospheric temperatures and extreme weather such as floods

Question 10

difference between global warming and climate change (2 points)

Answer 10

global warming accelerated by human activities that increase concentrations of greenhouse gases
climate change weather changes etc

Question 11

what is pollution

Answer 11

process by which harmful substances are added to the environment, making it undesirable or unfit for life, substances are called pollutants

Question 12

what does untreated sewage contain

Answer 12

phosphates and nitrates

Question 13

what is bioaccumulation

Answer 13

chemicals that are not excreted, accumulate in bodies of organisms that consume them