practis test short answer

Question 1

what is ewaste and why is it a problem

Answer 1

E-waste is the term given to obsolete electronic goods such as mobile phones, laptops, tablets, iPods and iPads, plasma and LCD televisions and electronic gaming machines. and. It is a problem because it is one of the fastest-growing waste types, generating nearly 50 million tonnes of e-waste worldwide in 2013. The safe disposal of these products is problematic because they are made up of many different materials that contain toxic substances such as lead, mercury, cadmium, arsenic and flame retardants. There are concerns about the working conditions in the processing plants where e-waste ends up because exposure to toxic substances can be hazardous to health

Question 2

Describe world population growth since 1000 CE.

Answer 2

There was a steady increase in world population between the year 1000 and the 1800s. In the year 1000 the population was 275 million. By the year 1800 the world population was 919 million. The rate of growth increased sharply from the 1800s, reaching more than 6 billion by the year 2000. The highest rates of world population growth occurred during the 1950s and 1960s, peaking at 2.2 per cent in 1963. Today, population growth is approximately 1.2 per cent per year and it is expected to decrease.

Question 3

What are the consequences of rapid population growth?

Answer 3

Increased demand for natural resources leads to over-exploitation and a decrease of biodiversity.
Increased use of fossil fuels for energy contributes to global warming.
More people live in poverty.
Increasing migration from rural to urban areas as people move in search of jobs, resulting in encroachment on open spaces as urbanisation progresses.

Question 4

What are the similarities and differences between Earth-centred and human-centred worldviews?

Answer 4

Human-centred viewpoint:
humans are superior species
nature serves humans
there is no obligation to care for the environment
humans control nature
economic development is a priority

Earth-centred viewpoint
all species are equal
there is a belief that humans depend on nature
sustainability and biodiversity are key beliefs

Similarities
none

Question 5

Name the three main processes that contribute to sea-level rise.
Te,Mg&Mic, MGA

Answer 5

Thermal expansion: the expansion of bodies of water when heated

Melting glaciers and mountain ice caps, which add water to rivers that flow to the oceans.

Melting of the Greenland and Antarctic ice sheets.