1.which activity is useful and will help save our planet?
a.dumping garbage everywhere
b.killing wild life animals in the forest
c.planting trees in appropriate vacant areas
d.turning on the lights and leaving them on after using

2.what is the effect of global warming in the planet?
a.more trees will grown in hot areas
b.melting of ice caps in some places in the world
c.growing more plants,trees,and different kinds of animals
d.making the planet explode that will make the earth inhabitable

3.what environmental problem is the result of chemical reactions in the atmosphere that involve sulfur?
a.acid rain
b.deforestation
c.holes in the ozone layer
d.smog

4.which of the following practices produces the most organic water pollution?
a.paper mills
b.recreational boating
c.intensive livestock farming
d.humans bathing in the water

5.the activity or activities that can deplete plant life and vegetation is/are____.
a.deforestation
b.environmental pollution
c.overgrazing
d.all of the above

6.which is the ultimate sink of all natural and man-made pollutants?
a.river
b.ocean
c.soil
d.all of the above

7.a renewable resource is a resource__________________.
a.that can be used only one time
b.which is replaced naturally and can be used again
c.that cannot be readily replaced by natural means fast enough to catch up to its usage
d.which is a new resource to the earth

8.the harmful consequences of human activity in the natural world are known as____.
a.ecosystem conflict
b.environmental topics
c.environmental issues
d.human intervention

9.the presence of industrial waste spills in groundwater is an example of______________.
a.pollution
b.osmosis
c.carbonization
d.conspiracy

10.main approach for conservation of water is________.
a.planting trees
b.constructing waste water treatment plants
c.a&b
d.none of the above​